''Neoglaphyrites'' is a goniatitid

ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) ...

that lived during the latest Pennsylvanian and early

Permian The Permian ( ) is a geologic period and stratigraphic system which spans 47 million years from the end of the Carboniferous Period million years ago (Mya), to the beginning of the Triassic Period 251.9 Mya. It is the last period of the Paleoz ...

. 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 Bisatoceratidae is a family of Late Paleozoic ammonites now included in the Thalassoceratoidea characterized by thick-discoidal to subglobular, involute shells in which lobes are simple. Some forms have spiral ornamentation. Bisatoceratidae was ...

, although this has not always been the case. Miller ''et al'' 1957, in the

Treatise on Invertebrate Paleontology The ''Treatise on Invertebrate Paleontology'' (or ''TIP'') 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 co ...

, placed ''Neoglaphyrites'' in the

Neoicoceratidae Neoicoceratidae is one of eleven families of the Neoicoceratoidea superfamily. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloid ...

as a synonym for '' Eoasianites''. Saunders 1999 is uncertain which family to include Neoglaphyrites in, but includes it in the Somoholotaceae.

References

* ''Neoglaphyrites'' entry i
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 Magazin

* * Ammonites of North America Goniatitida genera Bisatoceratidae Permian ammonites Pennsylvanian first appearances Cisuralian genus extinctions Paleozoic life of Nunavut {{Goniatitida-stub