''Aristoptychites'' is an extinct genus of cephalopod from the

Anisian In the geologic timescale, the Anisian is the lower stage or earliest age of the Middle Triassic series or epoch and lasted from million years ago until million years ago. The Anisian Age succeeds the Olenekian Age (part of the Lower Triassic Ep ...

stage of the Middle

Triassic The Triassic ( ) is a geologic period and system which spans 50.6 million years from the end of the Permian Period 251.902 million years ago ( Mya), to the beginning of the Jurassic Period 201.36 Mya. The Triassic is the first and shortest period ...

belonging to the

ammonoid 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) ...

subclass. Shell involute, whorls strongly embraced, venter acutely rounded. Suture curved, subammonitic; more closely resembles that of '' Flexoptychites'' or '' Discoptychites'' than of other ptychitids.

References

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''Aristoptychites''
Paleobiology Database, 6/8/12 Ptychitaceae Fossils of Svalbard Ceratitida genera Triassic ammonites Anisian life {{Svalbard-stub