Inachidae - Arrow Crabs

Crabs in the Inachidae family belong to a group of crabs known as arrow (or spider) crabs. Their bodies are either round or triangular shaped, usually narrowing at the anterior end. They all have an extend rostrum anteriorly that may be short or extremely long and narrow, and either simple or forked. Their legs are narrow and long, resembling that of a spider. Their heads lack orbits for their eyes to lie into.