Image: Pterygotus problematicus
Description: Fossils of Pterygotus problematicus published by John William Salter in 1852. Fig. 1 a. Part of the claw of Pterygotus problematicus, Agass., from the Upper Ludlow Rock of Hagley Park, Herefordshire:— this is probably the fixed finger, and shows the striated spines of unequal size. Fig. 1 b. Some of the spines, magnified. Fig. 2 a. From the same slab:— a portion probably of the spinous edge of the abdomen, with one of the lateral appendages (*) attached. Fig. 2 b. The appendage, fig. 2a*, magnified, to show the radiating striae and lateral teeth. This large spine or appendage may possibly be a terminal joint of one of the feet, pressed against the fragment, fig. 2 a, but not articulated with it.
Title: Pterygotus problematicus
Credit: Description of the Pterygotus problematicus, Agass
Author: John William Salter
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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