List of the Cenozoic life of Maryland

• †Abra – tentative report • †Abra longicalla • Acanthodesia • †Acanthodesia oblongula • †Acanthodesia savartii • †Acantodesia • †Acantodesia oblongula • sturgeon Acipenser'' • †Acrocoelum • †Acrocoelum richardsi – type locality for species • Acropora • †Acropora palmata • Acteocina • †Acteocina canaliculata • Acteon • †Acteon danicus – type locality for species • †Acteon ovoides • †Adocus • †Aepycamelus – tentative report • Aetobatus • †Aetobatus arcuatus • †Aetobatus irregularis • †Aetobatus profundus – type locality for species • †Aglaocetus'' • †Aglaocetus patulus • Alca • †Alca torda – or unidentified comparable form • Aligena • †Aligena aequata • †Aligena elevata • †Ambystoma • †Ambystoma maculatum • †Ambystoma tigrinum • Amia • †Amphicyon'' • Amyda • †Amyda cellulosa • Anachis • †Anachis avara • Anadara • †Anadara andrewsi • †Anadara ovalis • †Anadara subrostrata • †Anadara transversa • Anas • †Anas crecca • Ancilla – report made of unidentified related form or using admittedly obsolete nomenclature • Angulus • †Angulus agilis • Anomia • †Anomia aculeata • †Anomia marylandica • †Anomia multilineata • †Anomia simplex • Anticlimax – tentative report • †Anticlimax gardnerae – type locality for species • †Aphelops – tentative report • †Aporrhaid • †Aporrhaid gastropod • Aporrhais • †Aporrhais potomacensis • Aquila • †Aquila chrysaetos • †Araeodelphis – type locality for genus • †Araeodelphis natator – type locality for species • †Araloselachus • †Araloselachus cuspidata • Arca • †Arca callipleura • †Arca improcera • †Archaeohippus • Architectonica • †Architectonica form A informal • †Architectonica form B informal • , or short-faced bear, with a human to scale †Arctodus'' • †Arctodus pristinus • Argopecten • †Argopecten irradians • †Armatobalanus • †Armatobalanus calvertensis • Arossia • †Arossia bohaska – type locality for species • †Arossia cummembrana – type locality for species • †Arossia newmani • †Asaphis • †Asaphis centenaria • †Aspideretoides • †Aspideretoides virginianus • bivalve Astarte'' • †Astarte cuneiformis • †Astarte exaltata • †Astarte marylandica • †Astarte obruta • †Astarte perplana • †Astarte thisphila • †Astarte thomasi • †Astarte undata • Asterias • †Asterias forbesi – or unidentified comparable form • Astrangia • †Astrangia danae • †Astrehelia • †Astrehelia palmata • †Astrhelia • †Astrhelia plamata • †Astroscopus • †Astroscopus countermani'' – type locality for species • Astyris • †Astyris communis • †Astyris lunata • Ataphrus • †Ataphrus glandula • Athleta • †Athleta limopsis • †Athleta tuomeyi • †Atopomys • †Atopomys texensis • Atrina • †Atrina harrisi • †Atrina harrisii • †Aulophyseter'' • †Aulophyseter mediatlanticus – type locality for species ==B==

• baleen whale Balaenoptera'' • †Balaenoptera cephalus • †Balaenoptera pusilla – type locality for species • Balanus • †Balanus concabvus • †Balanus concava • †Balanus crenatus • †Balanus imitator • †Balanus vulcanellus – type locality for species • Bankia • †Bankia gouldi • Barnea • †Barnea costata • Bathytormus • †Bathytormus alaeformis • †Batiacasphaera • †Batiacasphaera sphaerica • †Belosphys • Bicorbula • †Bicorbula idonea • Blarina • , or northern short-tailed shrew †Blarina brevicauda'' • †Blarina carolinensis • †Bolis – or unidentified comparable form • Bonasa • †Bonasa umbellus • Boreotrophon • †Boreotrophon harasewychi – type locality for species • Brachidontes • †Brachidontes potomacensis • †Brachyprotoma • †Brachyprotoma obtusata • †Brevirostrodelphis • †Brevirostrodelphis dividum – type locality for species • †Brevoortia • , or Atlantic menhaden †Brevoortia tyrannus'' – or unidentified comparable form • Buccinofusus • †Buccinofusus chesapeakensis • †Buccinofusus parilis • Bufo • †Bufo americanus • †Bufo woodhousei • †Bulliopsis • †Bulliopsis marylandica • †Bulliopsis quadrata • Busycon – type locality for genus • †Busycon carica • †Busycon fusiforme • †Busycon fusiformis • †Busycotyphus • †Busycotyphus coronatum • †Busycotyphus rugosum • Busycotypus • †Busycotypus alveatum • †Busycotypus asheri – type locality for species • †Busycotypus canaliculatus • †Busycotypus coronatum • †Busycotypus rugosum ==C==

• Cadulus • †Cadulus bellulus • †Cadulus newtonensis • †Cadulus thallus • Caecum • †Caecum patuxentium • †Calianassa • †Calianassa atlantica • †Calianassa matsoni – or unidentified comparable form • Callinectes • †Callinectes ornatus • , or Chesapeake blue crab †Callinectes sapidus'' • Calliostoma • †Calliostoma alphelium • †Calliostoma aphelium • †Calliostoma humile – or unidentified comparable form • †Calliostoma philanthropus • †Calliostoma philathropus • Callista • †Callista marylandica • Callocardia • †Callocardia catharia • shearwater Calonectris'' • Calyptraea • †Calyptraea aldrichi – type locality for species • †Calyptraea centralis • †Calyptraphorus • †Calyptraphorus jacksoni • Cancellaria • †Cancellaria alternata • Cancer • †Cancer irroratus • Canis • '', or Armbruster's wolf †Canis armbrusteri – type locality for species • †Canis latrans • †Canis rufus – or unidentified comparable form • Cantharus • †Cantharus marylandicus • †Carassatellites • †Carassatellites turgidulus • Carcharhinus • †Carcharhinus egertoni • Carcharias • †Carcharias collata – type locality for species • Carcharodon • †Carcharodon auriculatus • , or broad-toothed mako †Carcharodon hastalis'' • Cardita • †Cardita protracta • †Caricella • Carphophis • †Carphophis amoenus • Caryocorbula • †Caryocorbula cuneata • †Caryocorbula inaqualis • Cassis • Castor • †Castor canadensis • Catapleura • †Catapleura repanda – type locality for species • †Cephalotropis – type locality for genus • †Cephalotropis coronatus – type locality for species • Cerastoderma • †Cerastoderma leptopleurum • Cervus • †Cetophis – type locality for genus • †Cetophis heteroclitus – type locality for species • Cetorhinus • †Cetotherium'' • †Cetotherium megalophysum • †Cetotherium parvum – type locality for species • Chama • †Chama corticosa • Chelone • Chelydra • †Chelydra serpentina • †Chesacardium • †Chesacardium craticuloides • †Chesacardium laqueatum • †Chesaclava – type locality for genus • †Chesaclava dissimilis • †Chesaclava quarlesi – type locality for species • †Chesaconavus • †Chesaconavus chesapeakensis • †Chesaconavus rossi • †Chesaconcavus • †Chesaconcavus chesapeakensis • †Chesaconcavus myosulcatus • †Chesaconcavus proteus • †Chesaconcavus rossi • †Chesaconcavus santamaria • †Chesapecten • †Chesapecten coccymelus • †Chesapecten coccymeus • †Chesapecten covepointensis • †Chesapecten jeffersonius'' • †Chesapecten madisonius • †Chesapecten monicae • †Chesapecten nefrens • †Chesapecten santamaria • †Chesasyrinx – type locality for genus • †Chesasyrinx rotifera • †Chesatrophon – type locality for genus • †Chesatrophon chesapeakeanus – type locality for species • Chlamys • †Chlamys choctavensis • †Chlamys sheldonae • †Chloridella • †Chloridella empusa • Chrysemys • , or painted turtle †Chrysemys picta'' • †Cimomia • †Cimomia marylandensis – type locality for species • Circulus – report made of unidentified related form or using admittedly obsolete nomenclature • †Circulus form A informal • Cirsotrema • †Cirsotrema form A informal • †Cirsotrema from B informal • Clavus • †Cleistophaeridium • †Cleistophaeridium placacanthum • Clementia • †Clementia inoceriformis • Clethrionomys • †Clethrionomys gapperi – or unidentified comparable form • Cliona • †Cliona sulphurea • †Clionia • †Clionia sulphurea • Coluber • †Coluber constrictor • Concavus'' • †Concavus concavus • †Concavus crassostricola • Condylura • †Condylura cristata • Conopeum • †Conopeum germanum • Conus • †Conus deluvianus • †Conus diluvianus • †Conus sanctaemariae – type locality for species • Coralliophaga • †Coralliophaga bryani • basket clam Corbula'' • †Corbula elevata • †Corbula inaequalis • †Corbula pectorosa – type locality for species • †Coronia • Crassatella • †Crassatella aquiana • †Crassatella marylandica • †Crassatella melinus • Crassostrea • †Crassostrea virginica • Crenilabium – or unidentified comparable form • †Crenilabium elatum • †Creonella • †Creonella obscuriplica – type locality for species • Crepidula • †Crepidula fornicata • †Crepidula plana • †Cretolamna'' • †Cretolamna appendiculata • Crotalus • †Crotalus horridus • Crucibulum • †Crucibulum constrictum • †Crucibulum costata • †Crucibulum multilineatum • , or hellbender salamander Cryptobranchus'' • †Cryptobranchus guildayi – type locality for species • Cucullaea • †Cucullaea gigantea • †Cucullaea transversa • Cumingia • †Cumingia tellinoides • †Cybium • Cyclocardia • †Cyclocardia granulata • †Cyclopsiella • †Cyclopsiella lusatica • Cyclostremiscus • †Cyclostremiscus sohli – type locality for species • Cylichna • †Cylichna venusta – type locality for species • Cymatosyrinx • †Cymatosyrinx mariana – type locality for species • †Cynarctus • †Cynarctus marylandica – type locality for species • †Cynarctus wangi – type locality for species • †Cynorca – tentative report • Cypraea • Cyrtopleura • , or angel wing clam †Cyrtopleura costata'' • Cythara • †Cythereis • †Cythereis tuberculata • Cytheridea • †Cytheridea punctillata • †Cytheris • †Cytheris tuberculata ==D==

• †Dallarca • †Dallarca elevata • †Dallarca elnia • †Dallarca idonea • †Dallarca staminea • †Dallarca subrostrata • stingray Dasyatis'' • †Dasyatis centrourus – or unidentified comparable form • †Delphinodon • †Delphinodon leidyi • Dentalium • †Dentalium attenuatum • †Desmathyus • Diadophis • †Diadophis punctatus • Diodora • †Diodora griscomi • †Diodora marlboroensis • †Diodora marylandica • †Diodora marylandicus • †Diodora nassula • †Diodora redimicula • †Diorocetus'' – type locality for genus • †Diorocetus hiatus – type locality for species • Diplodonta • †Diplodonta marlboroensis • †Diplodonta subvexa • †Dipoides • Discinisca • †Discinisca lugubris • †Discinisca lugubrius • Divalinga • †Divalinga quadrisulcata • †Dolicholatirus • Dosinia'' • †Dosinia acetabulum • †Dosiniopsis • †Dosiniopsis lenticularis ==E==

• †Eburneopecten • †Eburneopecten cerinus – type locality for species • †Eburneopecten dalli • Echinocardium • †Echinocardium marylandiense – type locality for species • Echinophoria – type locality for genus • †Echinophoria caelatura • †Ecphora • †Ecphora chesapeakensis – type locality for species • †Ecphora gardnerae'' • †Ecphora meganae • †Ecphora quadricostata • †Ecphora scientistensis • †Ecphora tampaensis • †Ecphora tricostata • †Ecphora turneri • †Ectoganus • †Ectoganus gliriformis – or unidentified comparable form • †Ectopistes • †Ectopistes migratorius • Elaphe • †Elaphe vulpina • Electra • †Electra monostachys • Elphidium • †Elphidium discoidale • †Elphidium incertum • †Elphidium latispatium • Ensis • †Ensis directus • †Ensis ensiformis • †Entobia • Entosolenia • †Entosolenia globosa • †Entosolenia lucida • Eontia • †Eontia palmerae • †Eontia ponderosa • †Eopleurotoma – or unidentified comparable form • †Eopleurotoma harrisi • †Eopleurotoma potomacensis • †Eosuchus'' • †Eosuchus minor • †Eosurcula – or unidentified comparable form • †Eosurcula ducateli • Epitonium • †Epitonium angulatum • †Epitonium chancellorensis – type locality for species • †Epitonium denticulatum • †Epitonium humphreysii • †Epitonium multistriatum • †Epitonium rupicola • †Epitonium sayanum • Eponides • †Eponides frigida • Eptesicus • †Eptesicus fuscus – or unidentified comparable form • Equus • †Equus complicatus • †Equus giganteus • Erethizon • †Erethizon dorsatum • , or the shrub ox. Robert Bruce Horsfall (1913). †Euceratherium'' • †Euceratherium collinum • †Euclastes – tentative report • Eucrassatella • †Eucrassatella melinus • Eulima • †Eulima brightseatensis – type locality for species • †Eulima form A informal • Eumeces • †Eumeces fasciatus – or unidentified comparable form • Eupleura • †Eupleura caudata • (above) †Eurhinodelphis'' • †Eurhinodelphis longirostris • Euspira • †Euspira heros • †Euspira marylandica • †Euspira tuomeyi ==F==

• Felis • †Felis couguar • †Ficopsis • Fissurella • †Fissurella fluviamariana – type locality for species • barnacles †Fistulobalanus'' • †Fistulobalanus klemmi • †Florilus • †Florilus chesapeakensis • †Florimetis • †Florimetis biplicata • †Fulgar • †Fulgar coronatum ==G==

• , or tiger shark Galeocerdo'' • †Galeocerdo aduncus • †Galeocerdo appendiculatus • †Galeocerdo contortus • †Galeocerdo latidens • Galeodea • Gari • †Gari gubernatoria • Gastrochaena • Gavia • †Gavia immer • †Gavialosuchus'' • †Gavialosuchus antiquus • Gegania • †Gegania marylandica • Gemma • †Gemma gemma • Genota – or unidentified comparable form • †Genota bellistriata • Geukensia • †Geukensia demissa • Gibbula – tentative report • †Gibbula glandula • †Gilbertina • †Gilbertina texana • , or New World flying squirrel Glaucomys'' • Globigerina • †Globigerina praebulloides • Globigerinoides • †Globigerinoides altiaperturus • †Globigerinoides sicanus • †Globoquadrina • †Globoquadrina altispira • Glossus • †Glossus fraterna • †Glossus ignolea – or unidentified comparable form • †Glossus markoei • †Glossus markoii • †Glossus marylandica • †Glossus mazlea • †Glossus santamaria • Glycimeris • †Glycimeris parilis • Glycymeris • †Glycymeris americana • †Glycymeris idonea • †Glycymeris lentiformis • †Glycymeris parilis • Glyptemys • †Glyptemys muhlenbergii • †Gomphotherium'' • †Gomphotherium obscurum – type locality for species • †Gryphaeostrea • †Gryphaeostrea vomer • Gulo • †Gulo gulo • Gyrinophilus • †Gyrinophilus porphyriticus – or unidentified comparable form ==H==

• †Habibacysta • †Habibacysta tectata • †Hadrodelphis – type locality for genus • †Hadrodelphis calvertense – type locality for species • †Halicetus – type locality for genus • †Halicetus ignotus – type locality for species • Haminoea • †Haminoea solitaria • augur sea snails Hastula'' • †Hastula inornata • †Hastula simplex • Haustator • †Haustator form A informal • †Haustator gnoma – type locality for species • †Haustator premortoni – type locality for species • †Heliadornis – type locality for genus • †Heliadornis ashbyi – type locality for species • Hemimactra • †Hemimactra solidissima • †Hemimactra subparilis • Hemipristis • †Hemipristis serra'' • †Hercoglossa • †Hercoglossa tuomeyi – type locality for species • †Hesperhys • Heterodon • †Heterodon platyrhinos – or unidentified comparable form • Hiatella • †Hiatella arctica • †Hiatella artica • Hippoporidra • †Hippoporidra edax • †Hippotherium'' • Hyla • †Hyla crucifer • Hyotissa • †Hyotissa haitensis • Hysteroconcha • †Hysteroconcha marylandica • †Hysteroconcha staminaea • †Hystrichosphaeropsis • †Hystrichosphaeropsis obscura ==I==

• Ictalurus • Ilyanassa • †Ilyanassa obsoleta • †Ilyanassa trivittata • Ischadium • †Ischadium recurvum • †Ischyodus'' • †Ischyodus williamsae – type locality for species • Isognomon • †Isognomon maxillata • †Isognomon tortum • Isurus • †Ixacanthus – type locality for genus • †Ixacanthus coelospondylus – type locality for species ==J==

• †Judithemys • †Judithemys kranzi – type locality for species ==K==

• Kalolophus • †Kalolophus antillarum • †Kapalmerella • †Kapalmerella mortoni • †Kentriodon'' – type locality for genus • †Kentriodon pernix – type locality for species • †Kummelia • †Kummelia americana • Kuphus – report made of unidentified related form or using admittedly obsolete nomenclature • Kurtziella • †Kurtziella cerina ==L==

• †Labyrinthodinium • †Labyrinthodinium truncatum • †Lacinia • †Lacinia pygmaea – type locality for species • Lacuna • †Lacuna feorra – type locality for species • †Laevihastula – type locality for genus • †Laevihastula marylandica – type locality for species • †Laevihastula simplex • †Lagodon • mackerel shark Lamna'' • †Lamna denticulata • †Lamna obliqua • †Lamna vincenti • Lampropeltis • †Lampropeltis triangulum • Lasiopodomys • †Lasiopodomys deceitensis • Lenticulina • †Lenticulina rotulata • Lepisosteus • †Leptomactra • †Leptomactra delumbis • †Leptomactra marylandica • †Leptophoca – type locality for genus • †Leptophoca lenis – type locality for species • †Leptophoca proxima – or unidentified comparable form • Lepus • , or snowshoe hare †Lepus americanus'' • †Levifusus • †Levifusus trabeatus • Libinia • †Libinia dubia • †Lingulodinium • †Lingulodinium macherophorum • Lirophora • †Lirophora alevata • †Lirophora alveata • †Lirophora latilirata • †Lirophora parkeria • Lithophaga – or unidentified comparable form • †Lithophaga marylandica • Littoraria • †Littoraria irrorata • Lontra • , or North American river otter †Lontra canadensis'' • †Lophocetus • †Lophocetus calvertensis – type locality for species • †Lophocetus pappus – type locality for species • †Lophochelys – tentative report • Lopholatilus • Loxoconcha • †Loxoconcha impressa • Lucina – report made of unidentified related form or using admittedly obsolete nomenclature • Lucina • †Lucina dartoni • †Lucina whitei • Lucinoma • †Lucinoma contracta • †Lucinoma filosa • Lunatia • †Lunatia catenoides • Lyonsia • †Lyonsia hyalina ==M==

• Macoma • , or Baltic clam †Macoma balthica'' • †Macoma calcarea • Macrocallista • †Macrocallista marylandica • †Macrocallista subimpressa • †Macrokentriodon – type locality for genus • †Macrokentriodon morani – type locality for species • Mactrodesma • †Mactrodesma subponderosa • †Mactrodesma subponderosum • †Mammut • †Mammut americanum • †Mammuthus • †Mammuthus columbi • , or American mastodon (right), and a Mammuthus primigenius, or wooly mammoth (left) †Mammuthus primigenius'' • Marginella • †Marginella minuta • †Mariacolpus – type locality for genus • †Mariacolpus plebeia • †Mariadrillia – type locality for genus • †Mariadrillia parvoidea • †Mariafusus – type locality for genus • †Mariafusus marylandica • †Marianarona – type locality for genus • †Marianarona asheri – type locality for species • †Marianarona marylandica – type locality for species • †Mariasalpinx – type locality for genus • †Mariasalpinx emilyae – type locality for species • †Mariasveltia – type locality for genus • †Mariasveltia lunata • †Mariaturricula – type locality for genus • †Mariaturricula biscatenaria • Marmota • , or groundhog †Marmota monax'' • Martesia • †Martesia cuneiformis • †Martesia ovalis • †Marvacrassatella • †Marvacrassatella marylandica • †Marvacrassatella melina • †Marvacrassatella turgidula • Massilina • †Massilina marylandica • Mathilda • †Mathilda crebricosta – type locality for species • †Mathilda form A informal • †Mathilda form B informal • †Mathilda form C informal • †Mathilda kauffmani – type locality for species • †Mathilda marylandensis – type locality for species • †Medoriopsis • †Medoriopsis marylandica • †Megalonyx'' • Megaptera • †Megaptera expansa – type locality for species • Melampus • †Melampus bidentatus • Melanitta • †Melanitta deglandi • Meleagris • †Meleagris gallopavo • †Melosia • †Melosia staminea • Membranipora • †Membranipora flabellata • Menestho • †Menestho form A informal • Mephitis • †Mephitis mephitis • Mercenaria • †Mercenaria blakei • †Mercenaria campechiensis • †Mercenaria cuneata – type locality for species • †Mercenaria ducatelli – tentative report • , also known as hard clams or quahogs †Mercenaria mercenaria'' • †Mercenaria plena • †Mercenaria staminea • †Mercenaria subcuneata • †Mercenaria tetrica • Meretrix • †Meretrix subimpressa • †Merychippus • †Mesocetus • †Mesocetus siphunculus • †Mesorhytis – tentative report • †Mesorhytis pomonkensis • †Mesorhytis potomacensis • †Messapicetus • †Messapicetus longirostris • †Metaxytherium'' • †Metaxytherium crataegense – type locality for species • †Micropogon • †Micropogon undulatus • Microtus • †Microtus chrotorrhinus – or unidentified comparable form • †Microtus guildayi • †Microtus involutus – or unidentified comparable form • †Microtus pennsylvanicus • Mictomys • †Mictomys borealis • Miltha • †Miltha aquiana • †Miocepphus • †Miocepphus bohaskai – type locality for species • †Miocepphus mcclungi • , or American cheetah †Miracinonyx'' • †Miracinonyx inexpectatus • Mitra • †Mitra marylandica • Modiolus • †Modiolus dalli • †Modiolus ducatelli • †Modiolus ducatellii • †Modiolus modiolus • †Modiolus potomacensis – type locality for species • †Moira – tentative report • †Moira atropos • †Monotherium • †Monotherium affine • Morus • †Morus avitus – type locality for species • Mulinia • †Mulinia lateralis • Mustela • , or American mink †Mustela vison'' – or unidentified comparable form • †Mya • †Mya arenaria • Myliobatis • †Myliobatis dixoni – type locality for species • †Myliobatis frangens – type locality for species • †Myliobatis fremenvillii – or unidentified comparable form • †Myliobatis gigas • †Myliobatis pachyodon • †Myliobatis vicomicanus • †Mylohyus'' • †Mylohyus fossilis – type locality for species • †Mylohyus obtusidens • Myotis • †Myotis grisescens – or unidentified comparable form • Myrtea – tentative report • †Myrtea astartiformis • †Myrtea uhleri • Mysella • †Mysella planulata • Mytilus • †Mytilus incurvus ==N==

• †Nanosiren – tentative report • Napaeozapus • †Napaeozapus insignis • Narona • †Narona potomacensis • Nassa • , or nassa mud snail Nassarius'' • †Nassarius peralta • †Nassarius vibex • Nemocardium • †Nemocardium lene • Neofiber • Neotoma – type locality for genus • †Neotoma floridana • †Neotoma spelaea – type locality for species • Nerodia • , or northern water snake †Nerodia sipedon'' • Neverita • †Neverita asheri – type locality for species • †Neverita cliftonensis • †Neverita discula – type locality for species • †Neverita duplicatus • †Neverita potomacensis – type locality for species • †Nodisurculina – type locality for genus • †Nodisurculina engonata • Noetia • †Noetia carolinensis • Nonion • †Nonion calvertensis • †Nonion pompilioides • †Nonion sloanii • Notidanus • †Notidanus primigeneus • †Notidanus primigenius • Notophthalmus • †Notophthalmus viridescens – or unidentified comparable form • Notorynchus • , or broadnose sevengill shark †Notorynchus cepedianus'' – type locality for species • Novocrania • †Novocrania lububris • Nucula • †Nucula potomacensis • †Nucula proxima • †Nucula prunicola • †Nucula taphria • Nuculana • †Nuculana acuta • †Nuculana cliftonensis • †Nuculana cultelliformis • †Nuculana improcera • †Nuculana liciata • †Nuculana luciata • †Nuculana parilis • †Nuculana tysoni ==O==

• Ochotona • †Ochotona princeps – or unidentified comparable form • Odocoileus • †Odocoileus virginianus • sand shark Odontaspis'' • †Odontaspis actutissima • †Odontaspis acutissima • †Odontaspis hopei • †Odontaspis littoralis • †Odontaspis macrota • †Odontaspis verticalis • †Odontaspis winkleri • †Odontopolys • Odostomia • †Odostomia insignifica • †Ogivalina • †Ogivalina parvula • Ondatra • †Ondatra annectens • †Ondatra zibethicus • †Operculodinium • †Operculodinium centrocarpum • †Operculodinium piaseckii • Opheodrys • †Opheodrys vernalis • Ophiura • †Ophiura marylandica • †Orycterocetus'' • †Orycterocetus crocodilinus • †Osteopygis • †Osteopygis roundsi • Ostrea • †Ostrea alepidota • †Ostrea carolinensis • †Ostrea trachydiscus – type locality for species • †Otodus • †Otodus angustidens – tentative report • (sometimes Carcharodon or Otodus megalodon) with a whale shark (violet), great white shark (green), and anachronistic human (black) to scale †Otodus megalodon'' • Otus • †Otus guildayi – type locality for species • †Oxyrhina • †Oxyrhina cuspidata • †Oxyrhina desorii • †Oxyrhina elegans • †Oxyrhina retroflexa • †Oxyrhina sillimani ==P==

• Pagurus • †Pagurus pollicaris • †Palaeocarcharodon • †Palaeocarcharodon orientalis • †Palaeocystodinium • †Palaeocystodinium golzowense • †Palaeophis'' • †Palaeophis grandis • †Pamicellaria • †Pamicellaria convoluta • Pandora • †Pandora gouldiana • Panopea • †Panopea americana • †Panopea elongata • †Panopea goldfussi • †Panopea goldfussii • †Panopea whitfieldi • Panopeus • †Panopeus herbstii • Panthera • , or lion †Panthera leo'' • †Panthera onca • Paraconcavus • †Paraconcavus rooseveltensis • †Paramya • †Paramya subovata • Parascalops • †Parascalops breweri • †Parietobalaena – type locality for genus • †Parietobalaena palmeri – type locality for species • Parvilucina • †Parvilucina crenulata • †Parvilucina multistriata • †Pasitheola • †Pasitheola marylandensis – type locality for species • Pecten • †Pecten humphreysii • †Pecten marylandica • Pekania • †Pekania diluviana – type locality for species • †Pelocetus – type locality for genus • †Pelocetus calvertensis – type locality for species • †Pelodelphis – type locality for genus • †Pelodelphis gracilis – type locality for species • †Pentadinium • †Pentadinium latincinctum – or unidentified comparable form • Periploma – tentative report • Perisoreus • , or grey jay †Perisoreus canadensis'' • Peromyscus • †Peromyscus cumberlandensis • †Peromyscus leucopus – or unidentified comparable form • †Petauristodon • †Petauristodon alpinus – or unidentified comparable form • Petricola • †Petricola calvertensis • †Petricola pholadiformis • Phacoides • †Phacoides anodonata • †Phacoides contractus • . Charles R. Knight (1898). †Phenacodus'' – tentative report • †Phenacomya • †Phenacomya petrosa • Phenacomys • †Phocageneus • †Phocageneus venustus • Pholadomya • †Pholadomya marylandica • †Physeterula • Physodon • †Physodon triqueter • Pinna • Pipistrellus • venus clam Pitar'' • †Pitar morrhuanus • †Pitar ovatus • †Pitar pyga • †Pitar subnasuta • Pitymys • †Pitymys cumberlandensis • Placopecten • †Placopecten clintonius • †Placopecten marylandica • †Placopecten virginiana • Platidia • †Platidia marylandica – type locality for species • of the genus Platygonus. Charles R. Knight (1922). †Platygonus • †Platygonus cumberlandensis • †Platygonus intermedius – type locality for species • †Platygonus tetragonus • †Platygonus vetus • Plecotus • †Plecotus alleganiensis – type locality for species • Plethodon • †Plethodon gultinosus • Pleurotomella • †Pleurotomella bellistriata – type locality for species • †Pliorhytis • †Pliorhytis centenaria • Pogonias • , or black drum †Pogonias cromis'' – or unidentified comparable form • †Poliniciella – type locality for genus • †Poliniciella marylandica – type locality for species • Polydora • Polystira • †Polystira barretti • †Polystira communis • Poromya • †Poromya subovata • †Praeorbulina • †Praeorbulina glomerosa • †Presbyornis'' • †Presbyornis isoni – type locality for species • †Prionodon • †Prionodon egertoni • Prionotus • †Prionotus evolans – or unidentified related form • †Priscodelphinus • †Priscodelphinus acutidens – type locality for species • †Priscodelphinus atropius – type locality for species • †Priscodelphinus conradi • †Priscodelphinus stenus – type locality for species • †Priscodelphinus uraeus • †Priscoficus • †Priscoficus arguta • Propebela • †Propebela marylandica – type locality for species • †Propebela parva • Prophaethon – tentative report • †Prosthennops • †Prosthennops niobrarensis • †Prosthennops xiphodonticus • †Protocardia • †Protocardia virginiana • Pseudacris • , or western chorus frog †Pseudacris triseriata'' • †Pseudoaptyxis • †Pseudoaptyxis sanctaemariae – type locality for species • †Pseudocepphus – type locality for genus • †Pseudocepphus teres – type locality for species • Pseudoliva • †Pseudoliva longicostata – type locality for species • †Pseudoliva tuberculifera • Pseudomalaxis – or unidentified comparable form • †Pseudomalaxis ripleyana • †Pseudophorus • †Pseudophorus calvertensis – type locality for species • †Pseudotrition • †Pseudotrition ruber • Pteria • †Ptychosalpinx • †Ptychosalpinx altilis • †Ptychosalpinx multirugata • †Ptychosalpinx pustulosus – type locality for species • shearwater Puffinus'' • †Puffinus conradi – type locality for species • Pycnodonte • †Pycnodonte percrassa • †Pyropsis – tentative report ==Q==

• foraminiferan Quinqueloculina'' • †Quinqueloculina flexuosa • †Quinqueloculina seminula ==R==

• †Rana • (sometimes Rana clamitans), or green frog †Rana clamitans'' • †Rana pipiens • †Rana sylvatica • Rangia • †Rangia cuneata • Ranzania • †Reticulatosphaera • †Reticulatosphaera actinocoronata • Retusa • †Retusa conulus • †Retusa marylandica • †Retusa sylvaerupis • †Rhabdosteus – type locality for genus • †Rhabdosteus latiradix – type locality for species • Rhinoptera • Rhynchobatus • †Rhynchobatus pristinus • †Roccus • (formerly Roccus saxatilis), or striped bass †Roccus saxatilis'' • †Rotalia • †Rotalia beccardi • †Rotalia beccarii ==S==

• Saccella • †Saccella parva • Salamandra • †Salamandra opaca • †Sangamona • †Sangamona fugitiva • †Scala • †Scala marylandica • †Scaldicetus'' • †Scapanorhynchus • †Scapanorhynchus subulatus – tentative report • Scaphander • †Scaphander potomacensis – type locality for species • Scaphella – type locality for genus • †Scaphella solitaria • †Scaphella virginiana • Sceloporus • †Sceloporus undulatus – or unidentified comparable form • †Schizodelphis'' • †Schizodelphis barnesi • †Schizodelphis sulcatus • Schizoporella • †Schizoporella unicornis • Sciaenops • †Sciaenops eastmani • Sciuropterus • †Sciuropterus volans • Sciurus • †Sciurus carolinensis • †Scutella • †Scutella aberti • †Sediliopsis – type locality for genus • †Sediliopsis gracilis • Seila • †Seila adamsii • Semele – tentative report • Semele • †Semele carinata • †Semele subovata • Serpulorbis • †Serpulorbis granifera • †Serpulorbis graniferus • †Sigmesalia • †Sigmesalia palmerae – type locality for species • Siphonalia • †Siphonalia devexus • †Siphonalia potomacensis – type locality for species • †Siphonocetus • †Siphonocetus clarkianus • †Siphonocetus priscus • †Smilodon'' • †Smilodon fatalis • †Smilodontopis • †Smilodontopis mooreheadi • Solariorbis • †Solariorbis form A informal • †Solariorbis laurelae – type locality for species • †Solariorbis lipara • †Solarium • †Solarium trilineatum • Solecardia • †Solecardia cossmani • Solen • Sorex • , or cinereus shrew †Sorex cinereus'' • †Sorex fumeus • Spermophilus • †Spermophilus tridecemlineatus • †Sphaerula • †Sphaerula subvexa • Sphenia – tentative report • †Sphyraenodus • †Sphyraenodus speciosus • hammerhead shark Sphyrna'' • †Sphyrna laevissima – type locality for species • †Sphyrna magna • †Sphyrna prisca • Spilogale • †Spilogale putorius – type locality for species • †Spiniferites • †Spiniferites mirabilis • Spiroplectammina • †Spiroplectammina spinosa • Spisula • †Spisula subcuneata • †Squalodon'' • †Squalodon atlanticus • †Squalodon calvertensis – type locality for species • †Squalodon mento – type locality for species • †Squalodon protervus • †Squalodon whitmorei • †Squalodon wymanii – type locality for species • Squatina • †Squatina occidentalis – type locality for species • Squilla • mantis shrimp †Squilla empusa'' • †Stenasodelphis – type locality for genus • †Stenasodelphis russellae – type locality for species • Stewartia • †Stewartia anodonta • †Stewartia foremani • Sthenorytis • †Sthenorytis pachypleura • Stramonita • †Stramonita haemostoma • †Strepsidura • Strioterebrum • †Strioterebrum dislocatum • Stylopoma • †Stylopoma spongites • †Sumatradinium • †Sumatradinium druggii • †Syllomus • †Syllomus aegyptiacus – type locality for species • Sylvilagus • †Sylvilagus floridanus • Synaptomys • , or southern bog lemming †Synaptomys cooperi'' • †Synechodus • †Synechodus clarki • †Synechodus clarkia • Syrnola • †Syrnola toulmini – type locality for species ==T==

• Tagelus • †Tagelus plebeius • Tamias • †Tamias striatus • Tamiasciurus • †Tamiasciurus hudsonicus • †Taphrosphys • †Taphrosphys miocenica – type locality for species • †Tapiravus • †Tapiravus validus – or unidentified comparable form • , or tapir Tapirus'' • †Tapirus haysii – or unidentified comparable form • †Tasbacka • †Tasbacka ruhoffi – type locality for species • Taxidea • †Taxidea taxus – type locality for species • †Tectatodinium • †Tectatodinium pellitum • Teinostoma • †Teinostoma barryi • †Teinostoma umbilicatum • Tellina • †Tellina virginiana • †Tellina williamsi • Terebra • †Terebra curvilirata • †Terebra inornata • Terebratula • †Terebratula marylandica – type locality for species • Teredo • †Teredo virginiana • Terrapene • †Terrapene carolina • Testudo • †Testudo ducateli – type locality for species • Textularia • †Textularia ultimainflata • Thamnophis • †Thecachampsa'' • †Thecachampsa antiqua • †Thecachampsa marylandica – type locality for species • †Thinocetus • †Thinocetus arthritus • Thomomys – type locality for genus • †Thomomys potomacensis – type locality for species • Thracia • †Thracia conradi • Torcula • †Torcula variabilis • †Tornatellaea • †Tornatellaea texana • Torquesia • †Torquesia prehumerosa – type locality for species • , or spectacled bear Tremarctos'' • †Tremarctos floridanus • †Tretosphys • †Tretosphys lacertosus – type locality for species • †Tretosphys ruschenbergeri – type locality for species • Triloculina • †Triloculina rotunda • Trionyx – report made of unidentified related form or using admittedly obsolete nomenclature • †Trionyx halophilus • Triphora • †Triphora tricincta • Tritonium • †Tritonium centrosum – type locality for species • Trochita • †Trochita aperta • †Trygon • †Trygon dux • †Tuba – tentative report • †Tuberculodinium • †Tuberculodinium vancampoae • Tudicla – or unidentified comparable form • Turricula – report made of unidentified related form or using admittedly obsolete nomenclature • †Turrifulgur – type locality for genus • †Turrifulgur turriculus – type locality for species • Turris – report made of unidentified related form or using admittedly obsolete nomenclature • †Turris piscatavensis • †Turris tysoni • Turritella'' • †Turritella alticostata • †Turritella exaltata • †Turritella humerosa • †Turritella indenta • †Turritella indentata • †Turritella plebeius • †Turritella plebeua • †Turritella potomacensis • †Turritella subponderosa • †Turritella subvariabilis • †Turritella terebriformis • , or bottlenose dolphin Tursiops'' • Typhis • †Typhis acuticosta ==U==