''Paranautilus'' is a genus of the
Nautiloid family Liroceratidae with a very involute, moderately globular, smooth shell. The venter, at the outer rim, is arched, grading into broadly convex flanks. The dorsom, on the inner rim, is deeply impressed. Septa a close spaced, with slightly sinuous sutures. A member of the
Clydonautilaceae
The Clydonautiloidea are a superfamily within the Nautiloidea, nautiloid order Nautilida characterized by smooth, generally globular, shellsKummel 1964; Nautiloidea -Nautilida, Treatise on Invertebrate Paleontology, Part K Nautiliodea, Geologica ...
, ''Paranautilus'' lived during the Middle and Late Triassic (
Anisian -
Norian
The Norian is a division of the Triassic Period. It has the rank of an age (geochronology) or stage (chronostratigraphy). It lasted from ~227 to million years ago. It was preceded by the Carnian and succeeded by the Rhaetian.
Stratigraphic defi ...
) in what is now North America, Europe, and south Asia. Contemporary
Liroceratids include ''
Indonautilus'' and ''
Sibyllonautilus''.
References
* Bernhard Kummel, 1964. Nautiloidea-Nautilida.
Treatise on Invertebrate Paleontology, Part K. Geological Soc. of America and University of Kansas press. Teichert and Moore (eds)
Paranautilus -Paleodb
Prehistoric nautiloid genera
Anisian first appearances
Norian extinctions
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