The Ptychitidae is a family of
ceratitid ammonites
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) ...
(''ammonites sensu lato''). They are combined with the
Eosagenitidae and
Sturiidae in the superfamily
Ptychitoidea
Ptychitoidea, formerly Ptychitacheae, is a superfamily of typically involute, subglobular to discoidal Ceratitida in which the shell is smooth with lateral folds or striations, inner whorls are globose, and the suture is commonly ammonitic. Their ...
.
Ptychitid genera have compressed, involute shells in which the inner whorls are covered by the outermost, that may be ribbed or smooth, and ammonitic sutures with secondary elements.
Genera
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Arctoptychites''
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Aristoptychites''
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Eosturia''
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Flexoptychites''
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Istreites''
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Lanceoptychites''
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Malletoptychites''
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Ptychites''
References
* Arkell, et al., 1957. Mesozoic Ammonoidea, ''in the'' Treatise on Invertebrate Paleontology, Part L . R. C.Moore (ed). Geological Society of America and Univ of Kansas press.
Ptychitidae-Paleodb classification of E.T. Tozer, 1994
Ptychitaceae
Ceratitida families
Middle Triassic first appearances
Late Triassic extinctions
{{Ceratitida-stub