Subvestinautilus

Subvestinautilus Temporal range: L Carboniferous (Miss)
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Nautiloidea
Order:	Nautilida
Superfamily:	Tainocerataceae
Family:	Koninckioceratidae
Genus:	Subvestinautilus Turner, 1954

Subvestinautilus is an evolute koninckioceratid genus, order Nautilida, with a depressed, trapezoidal whorl section. The venter is broadly rounded, ventrolateral shoulders sharply rounded, flanks flattened and converging toward a narrow rounded dorsum. In early growth stages a keel forms on the umbilical shoulder which becomes rounded or marked by a longitudal rib at maturity . The suture has a broadly rounded ventral lobe and a deeper lateral lobe.

Subvestinautilus, named by Turner, 1954, has been found in the Lower Carboniferous of Ireland and the Isle of Man.

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)
• Koninckioceratidae-Paleodb