Thoracoceras vestitum

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Discussion:

This specimen shows the large end of a straight orthocone nautiloid
with longitudinal ridges and a siphuncle located near the outer wall.

Viewer Comments:

The genus Thoracoceras is distinguished by having a shell with a
compressed cross section, although this specimen preserving part of
the body chamber and last formed closed chamber is only slightly
compressed. The large, thin-walled siphuncle located near the outer
wall can be seen inside the square box. T. vestitum was originally
described as having small spikes growing out along the longitudinal
ridges.

Tom Yancey

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Phylum Molusca (cephalopods)
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