''Paroxynoticeras'' is an extinct

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial n ...

lower Jurassic The Early Jurassic Epoch (in chronostratigraphy corresponding to the Lower Jurassic Series) is the earliest of three epochs of the Jurassic Period. The Early Jurassic starts immediately after the Triassic-Jurassic extinction event, 201.3 Ma&nbs ...

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 cuttle ...

that lived during upper Sinemurian. Animals belonging to this genus had platyconic shells with compressed whorl section and could grow to large sizes. In the case of young specimens, umbilicum is small, but it increases in bigger specimens.. Last whorl is excentric, which can occur also in relative species, ''

Paracymbites ''Paracymbites'' is an extinct genus of lower Jurassic ammonite that lived during Raricostatum zone of upper Sinemurian. Animals belonging to this genus had small shells with semicircular whorl section and rounded or fastigate venter, of which ...

''. While on the outer whorls, venter is always rounded, on inner whorls it can be both rounded or sharp. Ornamentation on inner whorls and suture is similar to ''

Oxynoticeras ''Oxynoticeras'' is an extinct genus of ammonite from the Early Jurassic of Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and t ...

'', but in bigger specimens, ribs became straight, simple and blunt. In these bigger specimens, midlateral tubercules might be present.

Distribution

Fossils belonging to this genus were found in Europe, Tunisia and Morocco.

References

Oxynoticeratidae Ammonitida genera Jurassic ammonites of Europe Ammonites of Africa Sinemurian life {{ammonitina-stub