Platyceras (Orthonychia) parva Swallow

   
Platyceras (Orthonychia) parva Swallow

General abundance:  Common

The Platyceras gastropods lived in a symbiotic association with crinoids.
Platyceras attached and scavenged directly off the crinoid calyx, perhaps
feeding off the ejected material from the anal tube.

This specimen is one of the largest found at this locality. Most are
less than a centimeter.

Reference:

Journal of Paleontology, Vol. 8 No. 2, June 1934
The Gastropods of the St. Louis, Missouri Pennsylvanian
Outlier: VII. The Euomphalidae and Platyceratidae
Author: J. Brookes Knight
page 163, plate 25, fig. 1a-1i

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