Styrionautilus
Styrionautilus is a genus of nautiloids and first of the Clydonautilidae with a range extending from the Middle Triassic, Anisian to the Upper Triassic, Norian. Its fossils found in North America (Nevada), Europe, and Timor.
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| Genus: | Styrionautilus Mojsisovics, 1902 |
In general form Styrionautilus is similar to other clydonautilids, smooth and involute. The suture however is more primitive. The ventral saddle is straight across without modification of a median lobe.
Styrionautilus may be derived from Indionautilus or similar form included in the Liroceratidae. In turn Styrionautilus is the likely ancestor of Proclydonautilus, Cosmonautilus, and/or Callaionautilus
References
- Bernhard Kummel, 1964. Nautiloidea-Nautilida. Treatise on Invertebrate Paleontology, Part K. Geological Society of America.
- Styrionautilus in Fossilworks gateway.
- J.J. Sepkoski 2002 Online list of cephalopod genera
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