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 have been found in North America (Nevada), Europe, and Timor.
| Styrionautilus | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | Nautilida |
| Family: | †Clydonautilidae |
| 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 edit
- 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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