Anomura: Families

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

Pylochelidae Bate, 1888

Common name. Symmetrical 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, or reduced, or absent; ocular acicles present, or absent. Antenna 1 flagellum biramous. Maxilliped 3 bases close together; crista dentata present; accessory tooth absent; dactylus simple, or subchelate, or chelate.

Pereopod 1 chelate; cheliped equal or subequal. 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; 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 posteriorly, abdomen with distinct somites. Epimera (pleura) present. Male pleopods 3-5 paired; pleopods 1 and 2 modified as gonopods. Male with no other sexual modifications; female with first pleopods paired and modified as gonopods. Uropods present, uropods positioned ventrolaterally, not forming tailfan; rami with propodal rasps. Telson present, entire or with transverse suture or partially divided longitudinally.

Larval development. Metamorphic.

Superfamily composition. Coenobitoidea.

Generic composition. Cancellocheles Forest, 1987; Cheiroplatae, Bate, 1888; Ciliopagurus, Mixtopagurus A. Milne-Edwards, 1880; Parapylocheles Alcock, 1901; Pomotocheles Miers, 1879; Pylocheles A. Milne-Edwards, 1880; Trizocheles Forest, 1987.

Habitat. Marine.

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.'.