FAO Species Identification Guide for Fishery Purposes Western

1072 Crabs
34a. Orbits long, eyes elongate; terrestrial to semiterrestrial crabs (Fig. 61) . . . . Ocypodidae (p. 1152)
34b. Orbits absent, eyes relatively short; semiterrestrial crabs (Fig. 62) . . . . . . . . . . . Mictyridae
a)
Fig. 61 Ocypodidae
(after Shen, 1932)
35a. Cross-section of dactylus of walking leg T-shaped (Figs 63 and 64). . . . . . Geryonidae (p. 1132)
35b. Cross-section of dactylus of walking leg not T-shaped, usually quadrate to ovate
(Fig. 63b) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . → 36
Fig. 62 Mictyridae
36a. Male abdominal segments 2 and 3 always immovable, completely to incompletely fused
(Fig. 65a); male first gonopods strongly bent (Fig. 66a); small semiterrestrial crabs
usually associated with estuarine habitats and mangroves (Fig. 67) . . . . . . . . Camptandriidae
36b. Male abdominal segments 2 and 3 always movable, never fused (Fig. 65b); male first
gonopods normal (Fig. 66b); aquatic to semiterrestrial crabs . . . . . . . . . . . . . . . . . . → 37
Fig. 64 Geryonidae
b)
a) T-shaped b) ovate
Fig. 63 cross-section of dactylus of walking leg
6
5
4
3
2
1
segments 2
and 3
immovable
a) b)
Fig. 65 abdomen
6
5
4
3
2
1
segments
2 and 3
freely
movable