FAO Species Identification Guide for Fishery Purposes Western

1064 Crabs
Fig. 15 Dromiidae
10a. Merus of third maxilliped distinctly triangular
in shape (Fig. 17a) . . . . . . . . . . . . . . . → 11
10b. Merus of third maxilliped quadrate to ovoid,
never distinctly triangular in shape
(Fig. 17b) . . . . . . . . . . . . . . . . . . . . . → 14
11a. Carapace longitudinally ovate; sternum
very narrow, thoracic sternites 5 to 7 very
narrow (Fig. 18a); fingers of chela strongly
bent (Fig. 19) . . . . . . . . . . . Raninidae (p. 1089)
11b. Carapace shape not as above; sternum
normal, thoracic sternites 5 to 7 not
strongly narrowed (Fig. 18b); fingers of
chela not strongly bent . . . . . . . . . . . . . . → 12
very
narrow
sternites
5-7
coxa of
cheliped
sternites
5-7
coxae of
legs
coxa of
cheliped
coxae
of
legs
a) Raninidae b) other crabs
Fig. 16 Homolodromiidae
(after Alcock and Anderson, 1899)
narrow,
triangular
merus
a) Raninidae b) others
sternites
5-7
Fig. 17 third maxilliped
quadrate
merus
Fig. 18 thoracic sternum
Fig. 19 Raninidae
(ventral side of body, between legs)
12a. Carapace subcircular with strong teeth on lateral margins; only dactylus of fourth leg
paddle-like (Fig. 21); vulvae of adult female exposed, not covered by abdomen
(Fig. 20a) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Orithyiidae
(family not recorded from the area so far)
12b. Carapace either of differing shape, or, if subcircular, never with strong teeth on lateral
margins; dactylus of fourth leg normal and styliform, or, if paddle-like, all other dactyli
of legs are also similarly structured; vulvae of adult female always covered by abdomen
(Fig. 20b) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . → 13
abdomen
vulva
(covered by
abdomen)
a)
vulva (not
covered by
abdomen)
b)
Fig. 20 position of female vulvae
paddle-like
Fig. 21 Orithyiidae
(after Shen, 1932)