Neoglaphyrites

Neoglaphyrites Temporal range: Late Pennsylvanian - Early Permian
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Goniatitida
Family:	†Bisatoceratidae
Genus:	†Neoglaphyrites Ruzhensev, 1938
Species
See text

Neoglaphyrites is a goniatitid ammonite that lived during the latest Pennsylvanian and early Permian. Its shell is ellipsoidal and moderately involute; the umbilicus deep and typically less than 15 per cent of the shell diameter but in some species closer to 20 per cent. Delicate growth lines forming ventral and lateral sinuses and ventrolateral and dorsolateral salients have been found on Canadian Arctic specimens. The suture is characterized by the ventral lobe split into two broad prongs that are separated by a high median ventral saddle; prongs closely approximate the width of the first lateral lobe. The first lateral saddle is evenly rounded and is nearly symmetrical. The umbilical lobe is V-shaped and internal lobes are deep and narrow.

General consensus is that Neoglaphyrites belongs in the Bisatoceratidae, although this has not always been the case. Miller et al 1957, in the Treatise on Invertebrate Paleontology, placed Neoglaphyrites in the Neoicoceratidae as a synonym for Eoasianites. Saunders 1999 is uncertain which family to include Neoglaphyrites in, but includes it in the Somoholotaceae.

References

• Neoglaphyrites entry in GONIAT Online 6/14/12
• W. B. Saunders, D. M. Work, & S. V. Nikolaeva, 1999. Evolution of Complexity in Paleozoic Ammonoid Sutures, Supplementary Material. Science Magazine [1]
• Arkell, W.J.; Kummel, B.; Wright, C.W. (1957). Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Lawrence, Kansas: Geological Society of America and University of Kansas Press.
• "Neoglaphyrites". The Paleobiology Database. Retrieved 18 July 2012.