Anomura: Families

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

Diogenidae Ortmann, 1892

Common name. Left-handed hermit crabs.

Description. Carapace cylindrical or subcylindrical, carapace longer than wide or as long as or wider than long; carapace with linea anomurica; outer orbital spines absent; rostrum reduced, or absent. Eye cornea well developed, or reduced; 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, or equal or subequal, or right 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, or dactyli and propodi of right and left dissimilar. 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 or reduced, carried posteriorly, abdomen with distinct somites or with indistinct somites. Epimera (pleura) absent. Male pleopods 3-5 unpaired; none modified as gonopods, or pleopod 1 with one or both modified as gonopods, or pleopod 2 with one or both modified as gonopods, or pleopods 1 and 2 modified as gonopods. Male with single gonopore, or with indications of female gonopores; female with no sexual modifications, or with single gonopore, or with first pleopods paired and modified as gonopods, or with brood pouch developed. 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. Allodardanus Haig & Provenzano, 1965; Aniculus Dana, 1852; Bathynarius, Calcinus Dana, 1852; Cancellus H. Milne-Edwards, 1836; Ciliopagurus, Clibanarius Dana, 1852; Dardanus Poulson, 1875; Diogenes Dana, 1852; Isocheles Stimpson, 1859; Loxocheles, Paguristes Dana, 1852; Paguropsis Henderson, 1888; Petrochirus Stimpson, 1859; Pseudopagurus Forest, 1952; Striogpagurus, Tisea Morgan & Forest, 1991; Trizopagurus Forest, 1952.

Habitat. Freshwater; 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.'.