Nassauoceras

Nassauoceras Temporal range: Midlle Devonian
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Nautiloidea
Order:	Nautilida
Superfamily:	Tainocerataceae
Family:	Tetragonoceratidae
Genus:	Nassauoceras Miller, 1932

Nassauoceras is a tetragonoceratid nautiloid from the Middle Devonian of Europe, the shell of which is evolute with a wide, deep umbilucus, slight dorsal impression, low arched venter, rounded ventral shoulders, and flanks that converge dorsally so as to produce a subtrigonal whorl section. Nodes are present on the ventral shoulders. Sutures have shallow ventral and lateral lobes. The siphuncle is near the ventral margin.

Nassauoceras differs from Tetragonoceras in that the latter is gyroconic with a subquadrate whorl section and angular ventral shoulders, but is somewhat similar to Wellsoceras in which whorls are in contact in the early growth stages and shoulders are also rounded.

References

• Bernhard Kummel, 1964. Nautiloidea-Nautilida; Treatise on Invertebrate Paleontology, Part L. R.C. Moore & Curt Teichert, eds. Geological Society of America, pub 1964.

This prehistoric cephalopod-related article is a stub. You can help Wikipedia by expanding it.v · Categories: Nautiloids Prehistoric cephalopod stubs Wikimedia Foundation. 2010. Игры ⚽ Нужна курсовая? Nassau Weekly Nassawango Hills, Maryland Look at other dictionaries: List of nautiloids — This list of nautiloids is a comprehensive listing of all genera that have ever been included in the subclass Nautiloidea, excluding purely vernacular terms. The list includes all commonly accepted genera, but also genera that are now considered… …   Wikipedia 18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”