Clarkesvillia
Encyclopedia
Clarkesvillia is an upper Ordovician westonocerid
genus the differs from Faberoceras
in having a more flattened venter and from the later Glyptodendron
in having its siphuncle more ventrally located.
see also list of nautiloids
Westonoceratidae
Westonoceratidae are exogastric, mostly compressed, Discosorida of moderate size from the Middle Ordovician to the Lower Silurian.The siphuncle is typically close to the convexly curved outer margin of the phragmocone -the chambered part of the shell- taken to be ventral but may be more central in...
genus the differs from Faberoceras
Faberoceras
Faberoceras is an extinct genus of prehistoric nautiloid. The nautiloids are a subclass of shelled cephalopods that were once diverse and numerous but are now represented by only a handful of species.-References:...
in having a more flattened venter and from the later Glyptodendron
Glyptodendron
Glyptodendron is a Lower Silurian westonocerid characterized by compressed cyrtocones with a narrowly rounded dorsum and greatest width in the ventrolateral region. Sutures slope forward from the dorsum which is on the longitudinally concave side. The siphuncle is slightly ventral from the center....
in having its siphuncle more ventrally located.
references
- Teichert, C. 1964. Nautiloidea -Discosorida. Treatise on Invertebrate PaleontologyTreatise on Invertebrate PaleontologyThe Treatise on Invertebrate Paleontology published by the Geological Society of America and the University of Kansas Press, is a definitive multi-authored work of some 50 volumes, written by more than 300 paleontologists, and covering every phylum, class, order, family, and genus of fossil and...
Part K Teichert and Moore, eds. - Clarkesvillia-Paleobiology DB
see also list of nautiloids