List of the Paleozoic life of Iowa

• †Abatocrinus • †Acidaspis • †Aclisina • †Actinocrinites'' • †Actinocrinites gibsoni • †Actinocrinites jugosus • †Actinocrinites lowei • †Actinocrinites pernodosus • †Actinocrinites probolos • †Actinopteria – tentative report • †Actinostroma • †Actinostroma clathratum • †Acutatheca • †Acutatheca propira • †Adocetocystis • †Adolfia • †Aechmina • †Aechmina cuspidata • †Aechmina ionensis • †Aechmina maquiketensis • †Aechmina taurea • †Agassizodus • †Agassizodus variabilis • †Agelacrinites • †Aglaocrinus • †Aglaocrinus compactus • †Allanella • †Allanella allani • †Allanella annae • †Allanella cardinalis • †Allenella • †Allenella allani • †Allenella annae • †Allocrinus • †Allocrinus ornatus • †Allocrinus subglobosus • †Allorhynchus • †Allorhynchus currei – or unidentified comparable form • †Allozygocrinus • †Allozygocrinus dubuquensis • †Alveolites • †Ambocoelia • †Ambocoelia louisianaensis • †Ambocoelia minuta • †Ambonychia • †Americoncha • †Americoncha marginata • †Amphicoelia • †Amphicyrtoceras • †Amphipora • †Amphipora pervesiculata • †Amplexus • †Anartiocystis • †Anastrophia • †Anataphrus • †Anematina • †Anematina conica • †Angyomphalus • †Angyomphalus lens • †Angyomphalus penelenticulata – type locality for species • †Anisotrypa • †Anomphalus • †Anthracospirifer • †Anthracospirifer pellaensis • †Antiquatonia • †Antirhynchonella • †Antirotella • †Antirotella kindlei – type locality for species • †Aorocrinus • †Aparchites • †Aparchites barbatus • †Aparchites carinatus • †Aparchites chatfieldensis • †Aparchites ellipticus • †Aparchites fimbriatus • †Aparchites macrus • †Aparchites paratumida • †Aphelecrinus • †Apycnodiscus • †Arabellites • †Arachnophyllum • †Archaeocalyptocrininus • †Archaeocalyptocrininus iowensis • †Archaeocalyptocrininus nodosus • †Archaeocalyptocrinus • †Archaeocalyptocrinus iowensis • †Archaeocalyptocrinus nodosus • †Archaeocrinus • †Archaeocrinus obconicus • †Archaeogastropod • †Archinacella • †Archinacella rotunda • †Arctinurus'' • †Arctomeristina • †Arisaigia • †Arrectocrinus • †Arrectocrinus iowensis • †Arthroxylon • †Asphaltinella • †Asterophyllites • †Asterophyllites multifolia • †Asthenophyllum • †Astraeospongium • †Astreptodictya • †Astrocystites • †Astrocystites ottawaensis – tentative report • †Atelodictyon • †Atelodictyon masoncityense – type locality for species • †Athyris • †Athyris cedarensis • †Athyris crassicardinalis • †Athyris fultonensis – or unidentified comparable form • †Athyris simplex • †Athyris spiriferiodes • †Athyris vitatta • †Athyris vittata • †Athyris zonulata • †Atribonium • †Atribonium nora • †Atribonium paupera • †Atribonium prolifica • †Atribonium subovata • †Atribonium swallovi • †Atrypa • †Atrypa reticularis'' • †Atrypa reticularus • †Atryparia • †Atryparia varicostata • †Atrypoidea • †Aulacella • †Aulocopella • †Aulocopella dactylos – type locality for species • †Aulocopella probolos – type locality for species • †Aulocopella scelidos – type locality for species • †Aviculopecten • †Aviculopecten marbuti – or unidentified comparable form ==B==

• Bairdia • †Bairdiocypris • †Bairdiocypris granti • †Bairdocypris • †Bairdocypris granti • †Basseleratia • †Basseleratia typa • †Bassleratia • †Bassleratia typa • †Batostomella • †Baylea • †Baylea trifibra – type locality for species • †Beecheria • †Beecheria chouteauensis • †Belemnocrinus • †Bellerophon'' • †Bellerophon blairi • †Bellerophon panneus • †Bellerophon patersoni • †Bellerophon vinculatus • †Bellornatia • †Bellornatia tricollis • †Belodina • †Belodina compressa • †Beloitoceras – tentative report • †Beloitoceras discrepana • †Bembexia • †Bembexia minima • †Bensbergia • †Bensbergia pulchra – type locality for species • †Beyrichia • †Beyrichia irregularis • †Bighornia • †Blothrocrinus • †Bobbodus • †Bobbodus schaefferi • †Bolicrinus • †Bolicrinus deflatus • †Bolicrinus globosus • †Bollia • †Bollia regularis • †Bollia ruthae • †Bollia subaequata • . The short spines which were attached to the tubercles are not drawn. †Bothriocidaris'' • †Bothriocidaris maquoketensis • †Botryocrinus • †Botryocrinus thomasi – type locality for species • †Brachythyris • †Brachythyris burlingtonensis – or unidentified comparable form • †Brachythyris chouteauensis • †Brachythyris peculiaris • †Brachytomaria • †Brachytomaria semele • †Breviphillipsia • †Brockocystis • †Brockocystis nodosaria • †Bromidella • †Bromidella depressa • †Bromidella rhomboides • †Bryantodina • †Bryantodina typicalis • †Bucanella • †Bucanella conradi • †Bucanopsis • †Bucanopsis lirata • †Bullatekka • †Bullatekka granilabiatus • †Bullatella • †Bullatella granilabiatus • †Bumastus'' • †Buranella • †Buxtonia – tentative report • †Byrsolopsina • †Byrsolopsina centipunctata • †Byrsolopsina normella • †Byrsolopsina ovata • †Byrsolopsina planilateralis • Bythocypris • †Bythocypris curta • †Bythocypris furnishi ==C==

• †Caenanoplia • †Caenanoplia logani • †Calamocarpon • †Calamocarpon insignis • †Calceocrinus • †Calceocrinus levorsoni • †Calcisphaera • †Calcisphaera laevis • †Calliocrinus • †Calliocrinus longispinus • †Callocrinus • †Callocrinus longispinus • †Callocystites • †Calvinaria • †Calvinaria ambigua • †Calvinaria bransoni • †Calvustrigis – tentative report • †Calymene'' • †Camarophorella • †Camarophorella lenticularis • †Camarotoechia • †Camarotoechia chemungensis • †Camarotoechia chouteauensis • †Camarotoechia crassiplicata • †Camarotoechia perplexa • †Camarotoechia quadricostatum • †Camarotoechia saxatilis • †Camarotoechia saxatillis • †Camarotoechia tuta • †Camerella • †Carabocrinus • †Carabocrinus radiatus • †Carabocrinus slocomi • †Cardiola • †Cardiola lyoni • †Carinatrypa • †Carinatrypa dysmorphstrota • †Cariniferella • †Cariniferella iowensis • †Carpocrinus • †Carpocrinus bodei • †Caryocrinites • †Catenipora'' • †Ceratocephala • †Ceratopsis • †Ceratopsis humilinoda • †Ceratopsis quadrifida • †Ceratopsis trilobis • †Ceraurus • †Cerithioides • †Cerithioides judiae • †Characterophyllum • †Characterophyllum nanum • †Charactoceras • †Charactophyllum • †Charactophyllum nanum • †Charionella • †Charionella nortoni • †Cheirurus'' • †Chomatodus • †Chomatodus inconstans • †Chonetes • †Chonetes glenparkensis • †Chonetes illinoisensis • †Chonetes logani • †Chonetes multicosta • †Chonetes multicostata • †Chonetes ornatus • †Chonetina • †Chonetinella • †Chonetipustula • †Chonetipustula concentrica • †Chonopectus • †Chonopectus fischeri • †Chonophyllum • †Clathrocoilona • †Clathrocoilona involuta – type locality for species • †Clathrodictyon • †Cleiocrinus • †Cleiocrinus regius • †Cleiothyridina • †Cleiothyridina crassicardinalis – or unidentified related form • †Cleiothyridina glenparkensis – or unidentified comparable form • †Cleiothyridina incrassata – or unidentified comparable form • †Cleiothyridina sublamellosa • †Climacoconus • †Climacoconus pumilus • †Climacograptus'' • †Climacograptus pumilis • †Climacograptus typicalis • †Clinolithes • †Clinopistha • †Clintonella – tentative report • †Clorinda • †Cochliodus • †Cochliodus occidentalis • †Coelospira • †Coeloterorhynchus • †Coeloterorhynchus schucherti • †Coeloterorhynchus subacuminata • †Coeloterorhynchus subacuminatus • †Coenites • †Composita • †Composita humilis – tentative report • †Composita immatura – or unidentified comparable form • †Composita trinuclea • †Compsocrinus • †Concavicaris • †Concavicaris sinuata – or unidentified comparable form • †Conocardium • †Conotreta • †Conularia • †Coolinia • †Cornulites'' • †Costistricklandia • †Costistricklandia castellana • †Costistricklandia multilirata • †Cotylacrina • †Cotylacrina sandra • †Cranaena • †Cranaena amana • †Cranaena arcuosa • †Cranaena calvini • †Cranaena depressa • †Cranaena elia • †Cranaena famelica • †Cranaena inflata • †Cranaena infrequens • †Cranaena iowensis • †Cranaena jacunda • †Cranaena lata • †Cranaena littleonensis • †Cranaena littletonensis • †Cranaena maculata • †Cranaena marsii • †Cranaena micula • †Cranaena navicella • †Cranaena occidentalis • †Cranaena pachytesta • †Cranaena parvirostra • †Cranaena rhomboidialis • †Cranaena rockfordensis • †Cranaena romingeri • †Cranaena seminula • †Cranaena subcylindrica • †Cranaena subglobosa • †Cranaena subglossa • †Cranaena subgobulosa • †Cranaena subouata • †Cranaena subovata • †Cranaena thomasi • †Cranaenella • †Crania • †Crania famelica • †Crassiproetus • †Crassiproetus arietinus • †Crassiproetus bumastoides • †Crassiproetus occidens • †Crassiproetus searighti • †Cremacrinus • †Cremacrinus gerki • †Cremacrinus guttenbergensis • †Cremacrinus punctatus – or unidentified related form • †Cremacrinus type locality for species – informal • †Cribanocrinus • †Crotalocrinintes • †Crotalocrinites'' • †Crurithyris • †Cryptophyllus • †Cryptophyllus oboloides • †Cryptophyllus sulcatus • †Ctenobolbina • †Ctenobolbina emaciata • †Ctenobolbina maquoketensis • †Ctenodonta • †Ctenodonta anatina • †Ctenodonta calvini • †Cupularostrum • †Cupularostrum contracta • †Cupularostrum saxatilis • †Cupularostrum saxatillis • †Cupulocorona • †Cupulocrinus • †Cupulocrinus angustatus • †Cupulocrinus conjugans – or unidentified related form • †Cupulocrinus crossmani • †Cupulocrinus latibrachiatus – or unidentified related form • †Curtognathus • †Cusacrinus • †Cyathaxonia • †Cyathaxonia arcuatus • †Cyathocrinites'' • †Cyathocrintes • †Cyathocrintes striatissimus – or unidentified comparable form • †Cyathophyllum • †Cyclocrinites • †Cyclocrinites dactilioides • †Cyclocrinites dactioloides • †Cyclocystoides • †Cyclonema • †Cyclonema bilix • †Cyclonema minuta • †Cyclora • †Cynopodius • †Cyphaspis • †Cypricardella • †Cypricardinia • †Cypricardinia sulcifera • †Cyrtia • †Cyrtia exporrecta • †Cyrtina • †Cyrtina inulta • †Cyrtina iowaensis • †Cyrtina triquetra • †Cyrtina umbonata • †Cyrtodonta • †Cyrtolites • †Cyrtospira • †Cyrtospirifer'' • †Cyrtospirifer disjunctus • †Cyrtospirifer whitneyi • †Cystiphyllum • †Cystiphyllum mundulum • †Cystodictya • †Cytocrinus ==D==

• †Dalejina • †Dalmanella • †Dalmanella edgewoodensis – or unidentified comparable form • †Dalmanites'' • †Dapsilodus • †Dapsilodus mutatus • †Dawsonoceras • †Decadocrinus • †Decadocrinus crassidactylus – type locality for species • †Decadocrinus pachydactylus – type locality for species • †Decadocrinus spinulifer – type locality for species • †Decaschisma • †Dechenella • †Dechenella haldemani – or unidentified comparable form • †Dechenella nortoni • †Dechenella prouti • †Dechenella rowi – or unidentified comparable form • †Deiphon'' • †Delocrinus • †Delocrinus vulgatus • †Deltaherpeton – type locality for genus • †Deltaherpeton hiemstrae – type locality for species • †Delthyris – tentative report • †Deltodus • †Deltodus spatulatus • †Dendrocrinus • †Dendrocrinus casei • †Dendrocrinus curvijunctus – or unidentified related form • †Dendrocrinus oswegoensis • tusk shell †Dentalium'' • †Dentalium grandaevum • †Derbyia • †Desquamatia • †Desquamatia brandonensis • †Desquamatia independensis • †Desquamatia randalia • †Desquamatia rotunda • †Desquamatia rusica • †Desquamatia scutiformis • †Desquamatia waterlooensis • †Devonatrypa • †Devonatrypa brandonensis • †Devonatrypa pronis • †Devonatrypa trowbridgei • †Devonatrypa waterlooensis • †Devonochonetes • †Devonochonetes calivini • †Devonoproductus • †Devonoproductus reticulocostus • †Devonoproductus vulgaris • †Devonoproductus walcotti • †Diamphidiocystis • †Diceromyonia • †Dichacaenia • †Dichacaenia harberti • †Dichocrinus • †Dicoelosia • †Dicranella • †Dicranella bicornis • †Dicranella marginata • †Dicranella simplex • †Dicranella spinosa • †Dicranella typa • †Dicranopeltis • †Dictyoclostus • †Dictyotomaria • †Dictyotomaria quasicapillaria – type locality for species • †Dielasma • †Dielasma burlingtonensis • †Dielasma chouteauensis • †Dielasma formosum • †Dimerocrinites • †Dimerocrinites hopkintonensis • †Dimerocrinites pentangularis • †Dimerocrinites sculptus • †Dinobolus • †Dinolobus • †Dinorthis • †Diopatraites • †Diphyphyllum • †Diploblastus • †Diploblastus glaber • †Diplograptus'' • †Diplograptus modestus – or unidentified comparable form • †Diplophyllum • †Diplosphaerina • †Diplosphaerina inaequalis • †Discosorus • †Disphyllum • †Disphyllum conjugans – type locality for species • †Disphyllum dispassum • †Disphyllum floydense • †Disphyllum iowensis – type locality for species • †Disphyllum tubiforme • †Dolerorthis • †Donaldina – tentative report • †Dorycrinus • †Dorycrinus gouldi • †Dorycrinus mississippiensis • †Douvillina • †Douvillina arcuata • †Douvillina cayuta • †Douvillina delicata • †Douvillina distans • †Douvillina maxima • †Douvillina navicula • †Douvillina oxycostratum • †Douvillina variabilis • †Douvillinaria • †Douvillinaria delicata • †Douvillinaria perversa • †Douvillinaria variabilis • †Douvillinaria variablis • †Drepanoistodus • †Drepanoistodus suberectus • †Dudleyaspis • †Dvorakia • †Dvorakia chattertoni – type locality for species ==E==

• †Earlandia • †Ecclimadictyon • †Ecclimadictyon fastigiatum • †Echinocoelia • †Echinocoelia halli • †Echinoconchus • †Ectenocrinus • †Ectenocrinus raymondi • †Ectenocrinus simplex • †Ectodemites • †Ectodemites primus • †Ectogrammysia • †Ectogrammysia hannibalensis • †Edestus'' • †Edestus crenulata • †Edestus mirus – type locality for species • †Edmondia • †Edmondia jejunus • †Eldredgeops • †Eldredgeops rana • †Eleutherokomma • †Eleutherokomma jasperensis • †Elita • †Elita diversa • †Elita inconsueta • †Elita johnsonensis • †Elita minor • †Elita subundifera • †Elita urbana • †Ellesmeria • †Ellesmeria scobeyi • †Ellesmeroceras • †Ellesmeroceras luthei • †Ellesmeroceras thomasi • †Emanuella • †Emanuella ii – report made of unidentified related form or using admittedly obsolete nomenclature • †Emanuella meristoides • †Emanuella sublineata • †Emphereaster • †Emphereaster missouriensis • †Encrinurus • †Endoceras'' • †Endostaffella • †Endostaffella discoidea • †Endothyra • †Endothyra obsoleta – tentative report • †Endothyranella • †Enoploura • †Enoploura wetherbyi • †Enteletes • †Entelophyllum • Eocaudina • †Eocaudina septaforaminalis – type locality for species • †Eochonetes • †Eochonetes aspera • †Eochonetes dignata – type locality for species • †Eochonetes recedens • †Eodictyonella • †Eolissochonetes • †Eomartiniopsis • †Eomartiniopsis rostrata • †Eoparisocrinus • †Eoparisocrinus crossmani • †Eophacops • †Eoplectodonta • †Eoschmidtella • †Eoschmidtella umbonata • †Eospirifer • †Eospirifer radiatus • †Eospirigerina • †Eospirigerina putilla – or unidentified comparable form • †Eostrophalosia • †Eostrophalosia independensis • †Eostrophalosia inexpectans • †Eostrophalosia rockfordensis • †Eosyringothyris • †Eosyringothyris aspera • †Eosyringothyris occidentalis • †Eosyringothyris thomasi • †Eosyringothyris triangularis • †Ephippiorthoceras • †Eridoconcha • †Eridoconcha gibbera • †Eridoconcha punctata • †Eridotrypa • †Erismacanthus • †Erismacanthus barbatus • †Erismodus • †Erismodus radicans • †Escharopora • †Eucalyptocrinites'' • †Eucalyptocrinites depressus • †Eucalyptocrinites inornatus • †Eucalyptocrinites ornatus – or unidentified comparable form • †Eucalyptocrinites proboscidalis • †Eukloedenella • †Eukloedenella richmondensis • †Eumetria • †Eumetria iowensis • †Eumetria osagensis • †Eumorphocystis • †Eunema • †Eunema quadrisulcata • †Euomphalus'' • †Euomphalus angularis • †Euomphalus obtusus • †Euphemites • †Euphemites lentiformis • †Euphemites urei • †Euprimitia • †Euprimitia celata • †Euprimitia flores • †Euprimitia labiosa • †Euprimitia linepunctata • †Euprimitia minuta • †Euprimitia sanctipauli • †Euptychocrinus • †Euptychocrinus skopaios • †Eurychilina • †Eurychilina incurva • †Eurychilina minutifoveata • †Eurychilina partifimbriata • †Eurychilina reticulata • †Eurychilina subradiata • †Eurychilina ventrosa • †Eutaxocrinus • †Eutaxocrinus gracilis • †Exocrinus • †Exocrinus multirami ==F==

• †Fardenia – tentative report • †Favosites • †Fenestella • †Fenestrellina • †Ferganella • †Fistulipora • †Flabellitesia • †Flabellitesia flabellites • †Flexicalymene'' • †Floweria • †Floweria altirostris • †Floweria orthoplicata • †Floweria prava • †Floyda • †Floyda concentrica • †Fourstonella ==G==

• †Galateacrinus • †Galateacrinus gossameri • †Gilmocrinus • †Girtyella • †Girtyella indianse • †Glabrocingulum • †Glabrocingulum angulosa – type locality for species • †Glabrocingulum minutum – type locality for species • †Glaphyrites • †Glossites • †Glyptorthis • †Glyptorthis pulchra – type locality for species • †Glyptorthis subcircularis – type locality for species • †Gomphocystites • †Goniatites'' • †Goniocrinus • †Goniophyllum • †Goniophyllum pyramidale • †Gorgonophontes • †Gorgonophontes peleron • †Graffhamicrinus • †Graffhamicrinus magnijkus • †Graffhamicrinus subcoronatus • †Grammysia • †Grammysia amygdalinus • †Gravicalymene • †Greenops • †Greenops barrisi • †Greenops fitzpatricki • †Grewingkia'' • †Gypidula • †Gypidula cornuta • †Gypidula munda • †Gypidula occidentalis • †Gypidula papyracea • †Gypidula parva • †Gypidulina • †Gyroceras ==H==

• †Hadrorhynchia • †Hadrorhynchia solon • †Haeretocrinus • †Haeretocrinus missouriensis • †Hagnocrinus • †Hallatia • †Hallatia convexa • †Hallatia duplicata • †Hallatia particylincrica • †Hallatia particylindrica • †Hallicystis • †Halliella • †Halliella magnipunctata • †Hallopora'' • †Halysiocrinus • †Halysiocrinus barrisi • †Halysiocrinus elephantinus – type locality for species • †Halysites • †Hammatostroma • †Hammatostroma albertense • †Harpidella – tentative report • †Harpidella brandonensis • †Harpidium • †Harpidium luckeyensis – or unidentified related form • †Harpidium maquoketa • †Hedeina • †Heliolites • †Heliophyllum'' • †Heliophyllum solidum • †Helliella • †Helliella magnipunctata • †Hemicystites • †Hemiphragma • †Hemiplethorhynchus • †Hemiplethorhynchus subovatum • †Hermatostroma • †Hermatostroma polymorphum • †Hernodia • †Hesperidella • †Hesperidella initialis • , also known as a Petoskey stone †Hexagonaria'' • †Hexagonaria bassleri • †Hexagonaria inequalis • †Hexagonaria oweni • †Hexagonaria whitfieldi • †Hibbardella • †Hibbardella subacoda • †Hindella • †Hindia • †Hindia parva – tentative report • †Hindia sphaeroidalis • †Holcocrinus • †Holopea'' • †Holopea iowaensis • †Homacanthus • †Homacanthus delicatulus • †Homoeospira • †Homotrypella • †Hormotoma • †Hormotoma gracilis • †Howellella • †Hudsonaster • †Huronia • †Hustedia • †Hyattidina • †Hybocrinus • †Hybocrinus conicus • †Hyolithes'' • †Hyolithes parviusculus • †Hypergonia • †Hypergonia percarinata • †Hypothyridina • †Hypothyridina emmonsi • †Hypothyridina intermedia • †Hypothyridina magister • †Hypselocrinus • †Hypsitycha • †Hypsitycha hybrida • †Hysitycha • †Hysitycha neenah • †Hystriculina ==I==

• †Ianthinopsis • †Ianthinopsis pinguis – type locality for species • †Icriodus • †Icriodus calvini – type locality for species • †Icriodus latericrescens • †Icriodus nodosus • †Icriodus orri – type locality for species • †Icriodus subterminus • †Icthyocrinus • †Idiognathodus • †Idiognathodus attenuatus – type locality for species • †Idiognathodus claviformis • †Idiognathodus iowaensis – type locality for species • †Ignoceras • †Ignoceras undata • †Indospirifer • †Indospirifer orestes • †Iniopteryx'' • †Iniopteryx rushlaui • †Iniopteryx tedwhitei • †Iocrinus • †Iowacystis • †Iowacystis sagittaria • †Iowaphyllum • †Iowaphyllum johanni • †Iowatrypa • †Iowatrypa americana • †Iowatrypa owenensis • †Ischadites • †Isorthis • †Isorthoceras • †Isorthoceras sociale • . †Isotelus'' ==J==

• †Kaskia • †Kayoceras • †Kiesowia • †Kiesowia binoda • †Kiesowia insolens • †Kinocrinus • †Kinocrinus inflatus • †Kionoceras'' • †Kionoceras decorahense – type locality for species • †Kirkidium • †Kitikamispira – tentative report • †Kitikamispira perstrialis – type locality for species • †Knightella • †Knightella shumardiana – type locality for species • †Kosovopeltis • †Kosovopeltis acamas • †Krausella • †Krausella arcuata • †Krausella curtispina • †Krausella inaequalis • †Krinocrinus • †Krinocrinus inflatus ==L==

• †Laccoprimitia • †Laccoprimitia elegantula • †Laccoprimitia fillmorensis • †Lacertasterias – type locality for genus • †Lacertasterias elegans – type locality for species • †Laddella • †Laddella insueta • †Ladogioides • †Ladogioides solon • Laevidentalium • †Lamottia • †Lamottia heroensis • †Lampterocrinus • †Lanecrinus – tentative report • †Leangella • †Lecanocrinus • †Lecathylus • †Lecathylus gregarius • †Lechritochoceras • †Leioclema • †Leioclema occidens • †Leiorhynchus • †Leiorhynchus argenteum • †Leiorhynchus gosseleti • †Leiorhynchus iris • †Leperditella • †Leperditella dorsicornis • †Leperditella fryei • †Leperditella macra • †Leperditella millepunctata • †Leperditella persimilis • †Leperditella sacceliformis • †Leperditia • †Lepidocyclus • †Lepidoleptaena – or unidentified related form • †Leptaena • †Leptaena rhomboidalis • †Leptagonia • †Leptagonia analoga • †Leptellina • †Leptobolus • †Leptobolus occidentalis • †Leptodesma • †Leptodesma acutilaris • †Leptodesma subovata • †Leptopora • †Leptopora typa • †Leptoptygma • †Leptoptygma oligospira – type locality for species • †Leptostrophia – tentative report • †Leptotrypella • †Lichenalia • †Lichenocrinus • †Lingula'' • †Lingula changi • †Lingula cuneata • †Lingula fragila • †Lingula milwaukeensis – or unidentified comparable form • †Lingula milwaukiensis • †Lingulodiscina • †Lingulodiscina marginalis • †Linocrinus • †Linoporella • †Linoproductus • †Linoproductus ovatus • †Liospira • †Liospira micula • †Liospira spicula – or unidentified comparable form • †Litostrobus • †Litostrobus iowensis • †Litostrobus paulus • †Lonchodus – tentative report • †Lophophyllidium • †Lophospira • †Lophospira depauperata • †Lorangerella • †Lorangerella gregaria • †Loxonema • †Lumbriconereites • †Luxocrinus • †Luxocrinus simplex • †Lyonicrinus • †Lyriocrinus • †Lysocystites • †Lysocystites nodosus • †Lytospira ==M==

• †Macgeea • †Macgeea camplanulata – type locality for species • †Macgeea concinnula – type locality for species • †Macgeea culmula • †Macgeea solitaria • †Macrocrinus • †Macrocrinus mundulus • Macrocypris • †Macrocypris kayi • †Macrocyproides • †Macrocyproides clermontensis • †Macronotella • †Macronotella arcta • †Macronotella scofeldi • †Macronotella scofieldi • †Macropotamorhynchus • †Macropotamorhynchus tuta • †Macrostylocrinus • †Macrostylocrinus compressus • †Macrostylocrinus obpyramidalis – or unidentified comparable form • †Macrostylocrinus vermiculatus • †Manicrinus • †Manticoceras'' • †Manticoceras regulare • †Manticrinus • †Maquoketacrinus • †Maquoketacrinus ornatus • †Maratia • †Maratia mara • †Maratia micula • †Marsupiocrinus • †Marsupiocrinus primaevus • †Mediospirifer • †Megalomoidea • †Megamyonia • †Megamyonia unicostata • †Megastrophia • †Megastrophia profunda • †Megistocrinus • †Megistocrinus pernodosus • †Melocrinites • †Merista • †Meristella'' • †Meristella parva • †Meristina • †Merocrinus • †Mesoblastus – or unidentified comparable form • †Mesolobus • †Metaconularia • †Metalonchodina • †Metalonchodina deflecta – type locality for species • †Michelia • †Michelinoceras • †Microcardinalia • †Milleratia • †Milleratia cincinnatiensis • †Milleratia cincinnattiensis • †Mirifusella – type locality for genus • †Mirifusella fortunata – type locality for species • †Modiomorpha • †Monomerella • †Murchisonia • †Myalina • †Mycterops • †Mycterops whitei – type locality for species • †Myeinocystites • †Myelodactylus • †Mystrocephala • †Mystrocephala pulchra – or unidentified comparable form • †Mystrocephala raripustulosus • †Mytilarca ==N==

• †Nactocrinus • †Nalivkinia – tentative report • †Nataliana – type locality for genus • †Nataliana sinuata – type locality for species • †Naticopsis'' • †Naticopsis depressa – type locality for species • †Neopanderodus • †Neospirifer • †Neozaphrentis • †Neozaphrentis pellaensis • †Nervostrophia • †Nervostrophia calvini • †Nervostrophia canace • †Nervostrophia contaderoensis • †Nervostrophia extensa • †Nervostrophia multinervosa • †Nervostrophia rockfordensis • †Nervostrophia solida • †Nervostrophia thomasi • †Newberria • †Newberria cordiforme • †Newberria johanni • †Ningulella • †Ningulella paucisulcata • †Nodambichilina • †Nodambichilina symmetrica • †Nucellangium • †Nucellangium glabrum • †Nucleospira • †Nucleospira barrisi • Nucula'' • †Nucula glanparkensis • †Nucula iowensis • Nuculana • †Nuculana sacata • †Nuculites • †Nuculites neglectus • †Nuculopsis ==O==

• †Odontopleura • †Oepikina • †Oistodus • †Oistodus venustus • †Onniella • †Onniella quadrata • †Onychodus'' • †Opikatia • †Opikatia emaciata • †Opikatia rotunda • †Opoa • †Orbiculoidea • †Orbiculoidea telleri • †Orbiculoidea varsoviensis • †Orbiculoidea wardi • †Orecopia • †Orecopia circinatus – type locality for species • †Oriostoma • †Orthoceras • †Orthoceras indianense • †Orthodesma • †Orthograptus • †Orthograptus eucharis • †Orthograptus truncatus • †Orthonychia • †Orthonychia vomerium • †Orthospirifer • †Orthospirifer capax • †Orthospirifer euruteines • †Orthospirifer iowensis • †Orthospirifer parryanus • †Orthotetes • †Orthotetes kaskaskiensis • †Otarion – tentative report • †Oulodus • †Oulodus abbreviata – type locality for species • †Oulodus serratus • †Ovatia • †Ovatia laevicostata • †Ovatia ovata • †Ozarkodina • †Ozarkodina campbelli – type locality for species • †Ozarkodina delicatula • †Ozarkodina raaschi ==P==

• †Pachyphyllum • †Pachyphyllum crassicostatum • †Pachyphyllum dumonti – type locality for species • †Pachyphyllum gregarium • †Pachyphyllum minutissimum • †Pachyphyllum websteri • †Pachyphyllum woodmani • †Paladin • †Paladin wilsoni • †Palaeocapulus • †Palaeocapulus equilateralis • †Palaeoconcha • †Palaeocyclus • †Palaeoneilo • †Palaeoneilo barrisi • †Palaeoneilo fecunda • †Palaeostachys • †Palaeostachys andrewsii • †Palaeozygopleura • †Palaeozygopleura difficile • †Palmatolepis • †Palmatolepis foliacea • †Palmatolepis semichatovae • †Panderous • †Panderous gracilis • †Panderous panderi • †Parabolbina • †Parabolbina antecedans • †Parabolbina carinifera • †Parabolbina staufferi • †Paracosmetocrinus • †Paracyclas • †Paracyclas dubia • †Paracyclas dubius • †Paracyclas elliptica • †Paracyclas parvula • †Paracyclas paucipleura • †Paracyclas proavia • †Paracyclas sabini • †Paracyclas validalinea • †Paracyclas validelinea • †Paraphorhynchus • †Paraphorhynchus elongatum • †Paraphorhynchus striatocostatum • †Paraschmidtella • †Paraschmidtella irregularis • †Paraschmidtella uphami • †Parenthatia • †Parenthatia camerata • †Parenthatia punctata • †Patellilabia • †Patellilabia scriptiferus • †Paucicrura • †Paucicrura corpulenta • †Paupospira • †Peachocaris'' • †Peachocaris acanthouraea – type locality for species • †Pedomphalella • †Pedomphalella intermedia • †Pedomphalella subovata • †Pentamerella • †Pentamerella dubia • †Pentamerella laeviscula • †Pentamerella laeviuscula • †Pentamerella magna • †Pentamerella multicostella • †Pentamerella obsolescens • †Pentamerella rugosa • †Pentamerella subarata • †Pentameroides • †Pentameroides corrugatus • †Pentameroides subrectus • †Pentamerus'' • †Pentamerus oblongus • †Pentlandina • †Pentremites • †Pentremites pulchellus • †Perditocardinia • †Perditocardinia iowensis – type locality for species • †Periechocrinus • †Pernopecten • †Pernopecten cooperensis • †Petalocrinus • †Petalocrinus mirabilis • †Petalodus'' • †Petalodus allegheniensis • †Petalotrypa • †Petalotrypa formosa • †Petrocrania • †Petrocrania famelica • †Petrocrania familica • †Petrodus • †Petrodus patelliformis • †Phacops • †Phacops iowensis • †Phanerotrema • †Philhedra • †Philhedra sheldoni • †Phillipsia • †Phoebodus • †Phoebodus densneptuni – type locality for species • †Pholidostrophia • †Pholidostrophia iowensis • †Phragmoceras • †Phragmodus • †Phragmodus cognitus • †Phragmodus undatus • †Phricodothyris • †Phymatopleura • †Physonemus • †Physonemus hamuspiscatorius • †Physonemus pandatus • †Piloricilla • †Piloricilla sedaliensis • †Pinnocaris • †Pinnocaris americana – type locality for species • †Pisocrinus • †Plaesiomys'' • †Plaesiomys subquadrata • †Plagioglypta • †Plagioglypta iowaensis • †Planalvus – type locality for genus • †Planalvus gibberosa – type locality for species • †Plasmopora • †Platyceras • †Platyceras antiquum • †Platyceras insolitum • †Platyceras irrasum • †Platyceras latum – tentative report • †Platyceras nasutum • †Platyceras paralium • †Platycrinites'' • †Platycrinus • †Platylichas • †Platyrachella • †Platyrachella ballardi • †Platyrachella macbridei • †Platyschisma • †Platyschisma barrisi • †Platyschisma depressa • †Platyschisma laudoni – type locality for species • †Platystrophia • †Platystrophia biforata • †Plectatrypa • †Plectodina • †Plectodina aculeata • †Plectodonta • †Plectodonta produla • †Pleurocystites'' • †Pleurocystites beckeri • †Pleurocystites filitextus – tentative report • †Pleurocystites strimplei • Pleurotomaria – tentative report • †Pleurotomaria verticillata • †Plicochonetes • †Plicostricklandia • †Podolithus • †Poleumita • †Polusocrinus • †Polusocrinus rosa • †Polygnathus'' • †Polygnathus decorosus • †Polygnathus intermedius • †Polygnathus parawebbi • †Polygnathus xylus • †Polyplacognathus • †Polyplacognathus ramosus • †Polytryphocycloides • †Polytylites • †Polytylites wilsoni • †Porcellia • †Porcellia crassinoda • †Porcellia obliquinoda • †Porcellia rectinoda – type locality for species • †Porocrinus • †Porocrinus crassus • †Porocrinus fayettensis • †Porocrinus pentagonius • †Porpites • †Posidonia • †Praecupulocrinus • †Praecupulocrinus conjugans • †Praenucula – tentative report • †Praewaagenoconcha • †Praewaagenoconcha speciosa • †Prasopora • †Prasoporina • †Pregazacrinus • †Pregazacrinus hemisphericus • †Primitia • †Primitia gibbera • †Primitia spinata • †Primitiella • †Primitiella bellevuensis • †Primitiella carlei • †Primitiella constricta • †Primitiella milleri • †Primitiella plattevillensis • †Primitiopsis – tentative report • †Primitiopsis bella • †Primitopsis – tentative report • †Primitopsis bella • †Priscella • †Probillingsites • †Productella • †Productella belanskii • †Productella camerata • †Productella fragilis • †Productella iowa • †Productella linnensis • †Productella perplana • †Productella rugatula • †Productella sericea • †Productella subaculeata • †Productella subalata • †Productella thomasi • †Productus • †Productus arcuatus • †Productus ovatus • †Productus sedaliensis • †Proetides • †Proetides insignis • †Proetus'' • †Proetus channahonensis – or unidentified comparable form • †Promexyele • †Promexyele peyeri • †Prospira • †Prospira greenockensis – or unidentified related form • †Prospira legrandensis • †Protacrocrinus • †Protatrypa • †Protaxocrinus • †Protoleptostrophia • †Protoleptostrophia fragilis • †Protomegastrophia • †Protometgastrophia • †Protoniella • †Protoniella parva • †Protoscolex • †Pseudoammodiscus • †Pseudoatrypa • †Pseudoatrypa bentonensis • †Pseudoatrypa blackhawkensis • †Pseudoatrypa boyeri – or unidentified comparable form • †Pseudoatrypa bremerensis • †Pseudoatrypa devoniana • †Pseudoatrypa minor • †Pseudoatrypa percrassa • †Pseudoatrypa rotunda • †Pseudoatrypa rugatula • †Pseudobelodina – tentative report • †Pseudoconocardium • †Pseudoglomospira • †Pseudopalmula • †Pseudopalmula palmuloides • †Pseudoplagiothyra • †Pseudoplagiothyra praecursor • †Pseudozygopleura • †Pseudulrichia • †Pseudulrichia simplex • †Pterinea • †Ptychophyllum • †Ptychopleurella • †Ptychopleurella bouchardi – or unidentified comparable form • †Ptychopteria • †Ptychopteria chemungensis • †Ptyctodopsis – type locality for genus • †Ptyctodopsis menzeli – type locality for species • †Ptyctodus'' • †Pugnoides • †Pugnoides calvini • †Pugnoides ottumwa • †Punctaparchites • †Punctaparchites rugosus • †Punctaparchites splendens • †Punctospirifer • †Punctospirifer solidirostris • †Pycnostylus • †Pyramiblastus • †Pyramiblastus fusiformis – type locality for species • †Pyrgocystis ==Q==

• †Quasibollia • †Quasibollia ridicula • †Quienquecaudex • †Quienquecaudex springeri ==R==

'' • †Raphistomina • †Raymondatia • †Raymondatia goniglypta • †Raymondatia gonigplyta • †Raymondiata • †Raymondiata goniglypta • †Resserella • †Retichonetes • †Retichonetes brandonensis • †Reticularia • †Reticularia cooperensis • †Retispira • †Retispira bilabiatus • †Retispira deflectus • †Retispira exilis • †Retispira perelegans • †Retispira type locality for species Kues & Batten 2001 – informal • †Rhaphanocrinus • †Rhaphistomina • †Rhineoderma • †Rhineoderma dinglensis • †Rhipidium • †Rhipidomella • †Rhipidomella cuneata • †Rhipidomella dalyana – or unidentified comparable form • †Rhipidomella tenuicostata • †Rhipidomella thiemei • †Rhodocrinites • †Rhombopora • †Rhynchodus • †Rhynchopora • †Rhynchopora pustulosa • †Rhynchopora rowleyi • †Rhynchotrema • †Rhynchotreta • †Rhyssochonetes • †Rhyssochonetes bellarugosis • †Rigidella • †Ripidiorhynchus • †Ripidiorhynchus cedarensis • †Rugosochonetes • †Rugosochonetes multicastatus ==S==

• †Saccelatia • †Saccelatia angularis • †Saccelatia arcuamuralis • †Saccelatia arrecta • †Saccelatia bullata • †Saccelatia cletifera • †Sanguinolites • †Scaphelasma • †Schellwienella • †Schellwienella crenulicostata • †Schellwienella inaequalis • †Schellwienella inflata • †Schellwienella planumbona • †Schizoblastus • †Schizoblastus roemeri • †Schizodus • †Schizodus sedaliensis • †Schizodus trigonalis • †Schizophoria • †Schizophoria amanaensis • †Schizophoria athabaskensis – or unidentified related form • †Schizophoria athabaskiensis – or unidentified related form • †Schizophoria chouteauensis • †Schizophoria dorsata • †Schizophoria floydensis • †Schizophoria floydia • †Schizophoria impressa • †Schizophoria iowensis • †Schizophoria landoni • †Schizophoria lata • †Schizophoria laudoni • †Schizophoria macfarlanei • †Schizophoria macfarlanii • †Schizophoria minor • †Schizophoria multistriata • †Schizophoria subelliptica • †Schmidtella • †Schmidtella affinis • †Schmidtella brevis • †Schmidtella lacunosa • †Schmidtella latimarginata • †Schuchertella • †Schuchertella acutistriata • †Schuchertella altirostris • †Schuchertella humboldtensis • †Schuchertella iowensis • †Schuchertella nodocostata • †Schuchertella parva • †Schuchertella pectiniformis • †Scofielda • †Scofielda bilateralis • †Scofieldia • †Scofieldia bilateralis • †Scutellum • †Scutellum depressum • †Scutellum thomasi • †Scytalocrinus'' • †Selenella • †Selenella pediculus • †Semitextularia • †Semitextularia thomasi • †Septemchiton • †Septemchiton iowaensis • †Septemchiton iowensis • †Septopora • †Serpulospira • †Serpulospira paradoxus – type locality for species • †Setigerites • †Shumardella • †Sieberella – tentative report • †Sieberella insolita • †Sievertsia • †Sigournea – type locality for genus • †Sigournea multidentata – type locality for species • †Similodonta • †Similodonta obliqua • †Simulodonta • †Simulodonta obliqua • †Sinuites • †Sinuites subcompressa • †Siphonocrinus • †Siphonocrinus nobilis • †Skenidioides – tentative report • †Skenidium • †Skenidium independense • †Smithiphyllum • †Smithiphyllum belanskii • †Sowerbyella • †Spathella • †Sphaerirhynchia • †Sphenothallus'' • †Spinatrypa • †Spinatrypa aspera • †Spinatrypa augusticostata – or unidentified comparable form • †Spinatrypa bellula • †Spinatrypa borealis • †Spinatrypa hystrix • †Spinatrypa mascula • †Spinatrypa occidentalis • †Spinatrypa planosulcata • †Spinatrypa rockfordensis • †Spinatrypa trulla • †Spinatrypina • †Spinatrypina angusticostata – or unidentified comparable form • †Spinatrypina edmundsi • †Spinocarinifera • †Spinocarinifera arcuata • †Spinocarinifera arcuatus • †Spinocyrtia • †Spinocyrtia alta • †Spinocyrtia ballardi • †Spinocyrtia capax • †Spinocyrtia cedarensis • †Spinocyrtia corvirostra • †Spinocyrtia curvirostra • †Spinocyrtia cyrtiformis • †Spinocyrtia cyrtinaformis • †Spinocyrtia iowensis • †Spinocyrtia macbridei • †Spinocyrtia pulchra • †Spinocyrtia westerensis • †Spinulicosta • †Spinulicosta spinulicosta • †Spirifer'' • †Spirifer biplicoides • †Spirifer forbesi • †Spirifer gregeri • †Spirifer legrandensis • †Spirifer louisianensis • †Spirifer marshallensis • †Spirifer missouriensis • †Spirifer orestes • †Spirifer platynotus • †Spirifer stratiformis • †Spiriferina • †Spiriferina solidirostris • †Spiriferina solidirostrus • †Spiriferina subtexta • †Spirinella • Spirorbis • †Spyroceras • †Stachyodes • †Stachyodes costulata • †Stainbrookia • †Stainbrookia infera • †Staufferella • †Staufferella falcata • †Stegocoelia • †Stegocoelia quadricincta – type locality for species • †Stenopareia • †Stenopareia slocomi – or unidentified comparable form • †Stenopareiea • †Stephanocrinus • †Stereostylus • †Stereostylus aages – type locality for species • †Stethacanthus'' • †Stethacanthus depressus • †Stethacanthus erectus • †Stictopora • †Stictostroma • †Stictostroma ordinarium • †Straparollus • †Straparollus ammon • †Straparollus argutus – type locality for species • †Straparollus cyclostomus • †Straparollus macromphalus • †Streptelasma • †Streptelasma trilobatum – or unidentified comparable form • †Streptis • †Streptognathodus • †Streptognathodus delicatulus – type locality for species • †Streptognathodus symmetricus – type locality for species • †Streptorhynchus • †Streptorhynchus tenuicostatum • †Striatochonetes • †Striatochonetes buchananensis • †Striatochonetes schucherti • †Striatopora • †Striatopora iowensis • †Stricklandia • †Stricklandia laevis • †Stricklandia lens • †Striispirifer • †Strimplecrinus • †Strobilocystites • †Stromatopora • †Strophalosia • †Strophodonta • †Strophodonta umbonata • †Stropholosia • †Stropholosia littletonensis • †Strophomena'' • †Strophomena abnormalis • †Strophomena biplacata • †Strophomena cedarensis • †Strophomena cicatricosa • †Strophomena costata • †Strophomena dorsata • †Strophomena erratica • †Strophomena halli • †Strophomena iowensis • †Strophomena linderi • †Strophomena littleonensis • †Strophomena littletonensis • †Strophomena masonensis • †Strophomena mineolaensis • †Strophomena nortoni • †Strophomena parva • †Strophomena perarcuata • †Strophomena planodorsata • †Strophomena plicata • †Strophomena quadratella • †Strophomena randalia • †Strophomena reticulata • †Strophomena scottensis • †Strophomena solonensis • †Strophomena subdemissa • †Strophomena thomasi • †Strophomena trilobata – type locality for species • †Strophomena unbonata • †Strophomena vera • †Strophonella • †Strophonelloides • †Strophonelloides reversa • †Strophostylus • †Strophostylus bivolve • †Stylonema – tentative report • †Sublobalocrinus • †Sublobalocrinus kasseri • †Sulcatostrophia • †Sulcatostrophia camerata • †Sulcatostrophia euglyphea • †Sygcaulocrinus • †Sygcaulocrinus typus • †Syringopora'' • †Syringostroma – tentative report • †Syringostroma confertum • †Syringothyris • †Syringothyris halli • †Syringothyris hannibalensis • †Syringothyris newarkensis ==T==

• †Tabulophyllum • †Tabulophyllum buccinum – type locality for species • †Tabulophyllum curtum – type locality for species • †Tabulophyllum ehlersi • †Tabulophyllum ellipticum • †Tabulophyllum expansum • †Tabulophyllum levorsoni – type locality for species • †Tabulophyllum longum • †Tabulophyllum magnum • †Tabulophyllum mutabile – type locality for species • †Tabulophyllum ponderosum • †Tabulophyllum rectum • †Tabulophyllum robustum • †Tabulophyllum rotundum • †Tabulophyllum solidum • †Tanaocystis • †Tanaocystis type locality for species – informal • †Tarphyphyllum • †Tarphyphyllum cylindricum – type locality for species • (right) †Taxocrinus'' • †Tecnocyrtina • †Tecnocyrtina curvilineata • †Tecnocyrtina missouriensis • †Tenticospirifer • †Tenticospirifer cyrtinaeformis • †Tenticospirifer cyrtinaformis • †Tenticospirifer shellrockensis • †Tetradella • †Tetradella carinata • †Tetradella ellipsilira • †Tetradella septinoda • †Tetradella subquadrans • †Tetradella ulrichi • †Teutonophon • †Teutonophon tangentialis • †Thaerodonta • †Thaerodonta recedens • †Thalamocrinus • †Theleproktocrinus • †Theleproktocrinus davidsoni • †Theodissa • †Theodissa hungerfordi • †Theodossia • †Theodossia hungerfordi • †Thomasaria • †Thomasaria altumbona • †Thomasatia • †Thomasatia falcicosta • †Thomasocrinus • †Thomasocrinus cylindrica • †Timeischytes • †Torynifer • †Trachydomia • †Trachydomia variata • †Tranodis • †Trapezophyllum • †Tremanotus • †Trichinocrinus • †Trigeria • †Trimerella • †Triplesia • †Trochonema • †Tropidodiscus • †Trupetustroma • †Trupetustroma bassleri • †Trupetustroma hayense • †Tubisalebra • †Turbonopsis • †Turbonopsis hackberryensis • †Turbonopsis spiculatus – type locality for species • †Tylothyris • †Tylothyris bimesialis • †Tylothyris inultilis • †Tylothyris megista • †Tylothyris mesacostalis • †Tylothyris rockfordensis • †Tylothyris subattenuatta • †Tylothyris subvaricosa • †Tylothyris sulcocostata ==U==

• †Ulocrinus • †Ulrichia • †Ulrichia saccula • †Unispirifer • †Unispirifer minnewankensis – or unidentified comparable form • †Unispirifer platynotus ==V==