Biology:Asymptoceras

Short description: Extinct genus of nautiloids

Asymptoceras Temporal range: Mississippian PreЄ Є O S D C P T J K Pg N
Asymptoceras newloni
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Nautiloidea
Order:	Nautilida
Family:	†Aipoceratidae
Genus:	†Asymptoceras Ryckholt, 1852
Species
†A. pyxis Shimanskiy, 1967 Shimanskiy, 1990 †A. tschernovi

Asymptoceras is a genus of aipoceratids (Nautiloidea) similar to Aipoceras but tightly coiled and with only part of the body chamber divergent from the previous whorl. Shell evolute, expanding fairly rapidly; umbilicus open, perforate; whorl section ovoid to subquadrate.

Asymptoceras is known from Mississippian (Lower Carboniferous) sediments in Europe and North America.

References

• Bernard Kummel, 1964. Nautiloidea - Nautilida; Treatise on Invertebrate Paleontology, Part K. Geological Society of America.
• Asymptoceras in Fossilworks

Wikidata ☰ Q19595960 entry