Mussel Pea Crab (Tumidotheres maculatus) zoea

Tumid mac1012

Tumidotheres maculatus (mussel pea crab zoea)

Location: 100 m offshore from Assateague Island, VA. in depths of 8-10 meters. Caught using an epibenthic sled (365 micrometer mesh). Summer 2009

Notes: Tumidotheres maculatus adults live commensally with mussels. The larvae are very similar to the closely related pea crabs in the genus Pinnixa but differences in the abdomen telson are diagnostic. See below.

Tumidotheres maculatus telson

ID Notes: The main difference distinguishing T. maculatus from the related Pinnixa species is lack of fleshy lateral lobes on the lower abdomen of Tumidotheres. The shapes of the telson are also quite different.

Collected by: William S. Johnson, Goucher College