''Peronoceras'' is genus of

ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) ...

that lived during the middle Toarcian stage of

early Jurassic The Early Jurassic Epoch (geology), Epoch (in chronostratigraphy corresponding to the Lower Jurassic series (stratigraphy), Series) is the earliest of three epochs of the Jurassic Period. The Early Jurassic starts immediately after the Triassic-J ...

. Members of this genus existed only in Fibulatum Subzone of Bifrons Zone. Their fossils were found in Europe, northern Africa, Asia, North America and South America.

Description

Form of their shell could range from depressed cadicone to compressed ellipsocone. Whorl section is quadrangular and has flat sides and venter. Ribs are present and they are fine to distant. They were always fibulate with the exception of inner whorls of finely ribbed species. On ventrolateral position, there were tubercules.

References

Dactylioceratidae Toarcian life Early Jurassic ammonites of Europe Ammonites of Africa Ammonites of Asia Ammonites of North America Ammonites of South America Ammonitida genera {{Ammonitina-stub