Mohawk Valley Fossils

Zygospira

The figure below shows the distribution of samples containing the spiriferid brachiopod Zygospira.

Zygospira is an uncommon spiriferid brachiopod in the MRV strata.

More images here.

Zygospira Hall, 1862 [*Atrypa modesta Say, in Hall, 1847] [=Anazyga Davidson, 1882]

Unequally biconvex, elongate or transverse shells, pedicle valve more convex, commonly with ventral fold and dorsal sulcus, simple plications; foramen mesothyridid, deltidial plates conjunct, beak ridges strong and well defined. Dental plates lacking; hinge plates disjunct, parallel medially, diverging ventrally, and supported by myophragm; spiralia directed submedially with dorsal inclination; jugum a simple band curving toward middle of valve, origin of jugum variable, anterior or posterior.
M. Ord. - U. Ord., ?L. Sil., Europe (Great Britain) - North America

Family Atrypidae Gill, 1871

Shell plicate or costate.
M. Ord. - U. Dev.

Order Spiriferida Waagen, 1883.

Treatise on Invertebrate Paleontology, H634