Platyceras arkonensis on Arthroacantha carpenteri

Description

An excellent example of a parasitic relationship, as the gastropod (Platyceras arkonensis) is sitting on the crinoid’s (Arthroacantha carpenteri) anus, where it fed on the waste. Both specimens display incredibly good detail, including that of a bryozoan growing on the gastropod. This specimen is from the Devonian Period, Hamilton Formation and was found in Arkona, Ontario.

approx. 3.5 x 3.5 x 3 cm (1.25 x 1.25 x 1.1 in)

weight: 0.027 kg (0.95 oz)