Neospirifer cameratus Morton

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Discussion:

This is a species that occurs in both the Moscow basin and the American midcontinent
and is moderately common in the late Pennsylvanian deposits of North America. The
genus Neospirifer is characterized by a bundling of ribs (fasciculate ribbing) that form
broad raised areas separated by low areas of ribbing. In Neospirifer cameratus the
fasciculate ribbing is limited to the early formed portions of the shell and more mature
portions of the shell have a ribbing pattern of equal sized ribs without fasciculation.
The shell has a compact shape (4 X 2.5 X 2.5 cm), is well inflated, has a moderate
sized interarea and wings with blunt ends.

The best discussion and comparison of North American Pennsylvanian species of
Neospirifer is presented in the monograph by Sutherland and Harlow (1973).

References:

Dunbar, C.O. and Condra, G.E., 1932, Brachiopoda of the Pennsylvanian
System in Nebraska; Nebraska Geological Survey, Bull. 5, p. 334-336,
pl. 39, fig. 4, 6-9.

Kalashnikov, N.V., 1998, Permian spiriferids from the north of
European Russia; Moscow, Geos, 139 p. 49-50, pl. 22, fig. 5, pl. 23, fig. 4

Sutherland,P.K. and Harlow, F.H., 1973, Pennsylvanian brachiopods and
biostratigraphy in southern Sangre de Cristo Mountains, New Mexico;
New Mexico Bureau of Mines and Mineral Resources, Memoir 27, p.
72-74, pl. 15, figs 5-8.


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