Fossil specimen of the gastropod Platyceras sp. attached to the calyx of the crinoid Arthracantha carpenteri; specimen is from the Devonian Arkona Shale of Ontario, Canada (PRI 76784). Specimen is from the collections of the Paleontological Research Institution, Ithaca, New York. Longest dimension of specimen is approximately 3.5 cm. Model by Emily Hauf.
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