FAO Species Identification Guide for Fishery Purposes Western

Key to Anomura 1079
a)
Fig. 103 Coenobitidae
7a. Adults distinctly crab-like; carapace well calcified in
adults, often with numerous strong granules or spines;
rostrum spiniform, distinct; second to fourth legs distinct,
fifth pair strongly reduced, inserted into branchial
chamber (Fig. 105) . . . . . . . . . . . . . . . . . . . Lithodidae Fig. 104 Diogenidae
7b. Adults typical hermit crabs; carapace weakly calcified in adults, rarely with granules or
spines; rostrum weak to indiscernible; second to third legs distinct, fourth and fifth pair
strongly reduced, but not inserted into branchial chamber . . . . . . . . . . . . . . . . . . . . → 8
Fig. 105 Lithodidae
Fig. 106 sixth segment and telson (dorsal view)
8a. First maxilliped with distinct flagellum; telson usually with median constriction, lateral
margins with median cleft (Fig. 106a); mostly shallow water with some deep-water
species (Fig. 107) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Paguridae
8b. First maxilliped without flagellum; telson without median constriction, lateral margins
entire (Fig. 106b); deep-water species (Fig. 108) . . . . . . . . . . . . . . . . . . Parapaguridae
b)
convex
margin
median
constriction
a) Paguridae b) Parapaguridae
Fig. 107 Paguridae Fig. 108 Parapaguridae