Research • A study on
hydrostatic properties of early
Paleozoic nautiloid and
endoceratoid cephalopods, and on its implications for the knowledge of ecology of these cephalopods, is published by Peterman, Barton & Yacobucci (2019). • A study on the distribution and diversity of cephalopods during the Cambrian–Ordovician transition is published by Fang et al. (2019). • A study on cephalopod occurrences in South China and adjacent areas during the Middle to Late Ordovician, aiming to define
biogeographic provinces, is published by Fang et al. (2019). • A study on changes of geographic range size and rates of speciation and extinction in
nautiloid and ammonoid cephalopods living in the North American Midcontinent Sea from the
Carboniferous (
Pennsylvanian)-early
Permian is published by Kolis & Lieberman (2019). •
Ascocerid fossils are described from the
Hirnantian?–
Llandovery strata of the
Eusebio Ayala and
Vargas Peña formations (southeastern
Paraguay) by Cichowolski et al. (2019), representing the first ascocerid record from high paleolatitudes of
Gondwana. • A juvenile specimen of
Dolorthoceras, representing the first
Devonian cephalopod specimen preserving
nacreous structures and the first
ectocochleate cephalopod preserving fibrous structures within its
conch, is described from the
Frasnian Domanic Formation (
Russia) by Doguzhaeva (2019). • A study on the response of cephalopod assemblages from the area of the present-day European
Russia to environmental changes during the
early Aptian Oceanic Anoxic Event is published by Rogov et al. (2019). • A study on the paleobiology of cephalopods from the
Albian Mahajanga Basin of
Madagascar will be published by Hoffmann et al. (2019). • A proposal for revision of the classification of
nautiloid cephalopods presented in
Treatise Part K is presented by King & Evans (2019), who name a new subclass
Tarphyceratia, new order
Rioceratida and new family
Bactroceratidae. • A study on embryonic and early juvenile development of shell in
Peismoceras is published by Manda & Turek (2019). • A study on changes of the morphological diversity of Late Permian coiled nautiloids is published online by Korn et al. (2019). • A study on the paleobiology of
Angulithes mermeti, based on new material from the upper
Cenomanian of
Egypt, and on its implications for the knowledge of the evolution of Cenomanian lineage of
Angulithes, is published by Wilmsen & Nagm (2019). • A study on the anatomy of
Gordoniconus beargulchensis and on its implications for the knowledge of evolution of
coleoids is published by Klug et al. (2019). • A study on a putative
Sinemurian octocoral Mesosceptron from Montagna del Casale (
Sicily,
Italy) is published by Pignatti et al. (2019), who reinterpret the fossils of this taxon as incompletely preserved coleoid rostra, and consider
Mesosceptron to be a
subjective junior synonym of the genus
Atractites. • A study on four specimens of
Clarkeiteuthis conocauda from the
Toarcian Posidonia Shale (
Germany) preserved with small bony fish in their arm crowns, on the feeding behaviour of members of this species, and on the differences in the mode of life of
C. conocauda,
Passaloteuthis bisulcata and
Hibolithes semisulcatus, is published by Jenny et al. (2019). • A study on
belemnite body-size dynamics across the
Pliensbachian–
Toarcian boundary in the Peniche section (
Lusitanian Basin,
Portugal), evaluating its implications for the knowledge of the impact of the Pliensbachian–Toarcian boundary warming event on belemnite body size, is published by Rita et al. (2019). • New belemnite fossils are described from the
Berriasian–
Hauterivian of Arctic
Canada and North-East
Greenland by Mutterlose et al. (2019), who also evaluate the implications of these fossils for the knowledge of spatial distribution patterns of belemnites at northern high latitudes.
New taxa ==Gastropods==