Anomura: Families

P. McLaughlin, S. Ahyong & J.K. Lowry

Coenobitidae Dana, 1852

Common name. Land hermit crabs.

Description. Carapace cylindrical or subcylindrical, carapace longer than wide; carapace with linea anomurica; outer orbital spines absent; rostrum reduced, or absent. Eye cornea well developed; ocular acicles present. Antenna 1 flagellum biramous. Maxilliped 3 bases close together; crista dentata present; accessory tooth absent; dactylus simple.

Pereopod 1 chelate; cheliped left largest. Pereopods 2 to 4 pereopods 2 and 3 similar, perepod 4 greatly reduced; 2-4 with basis and ischium fused; dactyli of pereopods 2 to 3 simple. Pereopod 3 about the same length as pereopod 2, or shorter than pereopod 2; pereopods 3 dactyli and propodi of right and left similar. Pereopod 4 chelate. Sternum partially divided; sternite of pereopod 5 reduced, widely separated from preceding sternite; somite of pereopod 5 not fused with first abdominal somite.

Abdomen well developed, carried under thorax or reduced, carried posteriorly, abdomen with distinct somites or with indistinct somites. Epimera (pleura) absent. Male pleopods 3-5 unpaired; none modified as gonopods. Male with no other sexual modifications, or with sexual tube(s); female with no sexual modifications. Uropods present, uropods positioned ventrolaterally, not forming tailfan; rami with propodal rasps. Telson present, entire.

Larval development. Anamorphic, or metamorphic.

Superfamily composition. Coenobitoidea.

Generic composition. Birgus Leach, 1816, Coenobita Latreille, 1825.

Habitat. Terrestrial.

Distribution. Worldwide except Arctic and Antarctic.

Cite this publication as: ' McLaughlin, P., S. Ahyong & J.K. Lowry (2002 onwards). 'Anomura: Families.' Version: 2 October 2002.'.