Mosquoceras tschernyschewi (Tzwetaev, 1888)

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Discussion:

A large thick-shelled coiled nautiloid.

Viewer Comments:

This nautiloid is quite distinctive in having large nodes on the
outer shoulder that are curved and oblique to the radius and the
outer edge of the whorl. Suture patterns of the septa are visible
below the large nodes in the top left photo and the large central
siphuncle can be seen on a septal surface in the photo at top right.
A central location of the siphuncle is characteristic of the
nautiloids. This type of large nautiloid is fairly common in late
Carboniferous and early Permian shallow marine environments.

Tom Yancey

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