''Apleuroceras'' is a genus of

ceratitid Ceratitida is an order that contains almost all ammonoid cephalopod genera from the Triassic as well as ancestral forms from the Upper Permian, the exception being the phylloceratids which gave rise to the great diversity of post-Triassic ammon ...

ammonite Ammonoids are extinct, (typically) coiled-shelled cephalopods comprising the subclass Ammonoidea. They are more closely related to living octopuses, squid, and cuttlefish (which comprise the clade Coleoidea) than they are to nautiluses (family N ...

s with an essentially smooth evolute shell with a subquadrade whorl section and a ceratitic suture with two lateral lobes (on either side). ''Apleuroceras'' belongs to the

Aplococeratidae Aplococeratidae is a family of Ceratitida, ceratitids from the Middle Triassic with very simplified sutures and a tendency to lose their ornamentation. Shells are generally evolute, more or less compressed, with rounded venters. Ornamentation if ...

and has been found in middle

Triassic The Triassic ( ; sometimes symbolized 🝈) is a geologic period and system which spans 50.5 million years from the end of the Permian Period 251.902 million years ago ( Mya), to the beginning of the Jurassic Period 201.4 Mya. The Triassic is t ...

formations of

Ladinian The Ladinian is a stage and age in the Middle Triassic series or epoch. It spans the time between Ma and ~237 Ma (million years ago). The Ladinian was preceded by the Anisian and succeeded by the Carnian (part of the Upper or Late Triassic ...

age in Hungary and the Alps.

References

* Arkell ''et al'' 1957. Mesozoic Ammonoidea;

Treatise on Invertebrate Paleontology The ''Treatise on Invertebrate Paleontology,'' published from 1953–2007 by the Geological Society of America and the University of Kansas, then 2009–present by the University of Kansas Paleontological Institute, is a definitive multi-authore ...

, Part L (''L''158). Geological Society of America and University Kansas Press.
Paleobiology database ''Apleuroceras'' entry
accessed 9 December 2011 Aplococeratidae Middle Triassic ammonites Ceratitida genera Triassic ammonites of Europe {{Ceratitida-stub