FAO Species Identification Guide for Fishery Purposes Western

1068 Crabs
Fig. 40 Majidae
22a. Antennal flagellum distinctly setose
(Fig. 42a) . . . . . . . . . . . . . . . . . . . → 23
22b. Antennal flagellum slightly setose to
glabrous (Fig. 42b) . . . . . . . . . . . . . . → 26
23a. Front entire, without teeth or lobes; anterolateral
and posterolateral margins
of carapace lined with dense, long setae
forming distinct fringe (Fig. 43) . . . . . Thiidae
(family not recorded from the area so far)
23b. Front with teeth or lobes; anterolateral
a) highly setose b) slightly setose
and posterolateral margins of carapace
with relatively dense setae, but
Fig. 42 antennal flagellum
not forming distinct fringe . . . . . . . . . . . → 24
24a. Antennae very long, longer than or as long as carapace length, strongly setose (Fig. 44). . Corystidae
24b. Antennae short, much shorter than carapace length, not strongly setose. . . . . . . . . . . . → 25
Fig. 43 Thiidae
(after Christiansen, 1969)
25a. Carapace usually rounded to longitudinally
ovate; vulvae of adult
female completely covered by abdomen
(Figs 45a and 46) . . . . Atelecylidae
25b. Carapace squarish to hexagonal;
vulvae of adult female exposed,
not covered by abdomen
(Figs 45b and 47) . . . . . . . Cheiragonidae
(family not recorded from the area so far)
Fig. 41 Hymenosomatidae
(after Shen, 1932)
long
antenna
Fig. 44 Corystidae
abdomen vulva
abdomen
(covered by
abdomen)
a) b)
Fig. 45 position of female vulvae
vulva (not
covered by
abdomen)