Camerisma pyramidata Lazarev, 1975

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Discussion:

This brachiopod has a strongly curved, thick-walled shell with an
angular form, an overhanging beak and overlapping valves. The adult
shell has a high median fold and a sharp narrow groove in the middle
of the sulcus.

Camerisma is a rhynchonellid with an unusual shape. It commonly
develops overlapping valves and flared margins at maturity. Adults
usually have an asymmetric form with the left side and the right side
being unequally developed, a very unusual condition for a brachiopod.

The specimen shown here is a topotype specimen, obtained from the
type locality for the species at the Gzhel quarries (cited as "Gzhel
Station": Lazarev, 1975)

References:
Lazarev, S.S., 1975, Middle and Late Carboniferous Stenoscismatacea
(Brachiopoda) of the Moscow Syneclise; Paleontological Journal, v. 9,
no. 2, p.213-220, pl. 8, fig. 1-4.
["Sredne - posdnekamennougolnie brachiopody Stenoscimatacea
Moskovskoy sineklisy"]

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