''Paroxynoticeras'' is an
extinct
Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...
genus of
lower Jurassic 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
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''. 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'', 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
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