FAO Species Identification Guide for Fishery Purposes Western

Key to Brachyura 1069
Fig. 46 Atelecylidae
(after Alcock and Anderson, 1899)
Fig. 47 Cheiragonidae
(after Sakai, 1976)
26a. Carapace hexagonal, its width and length subequal; front broad compared to maximum
carapace width; anterolateral margins of carapace weakly convex, each with 4 or 5
well-developed teeth (Fig. 48) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pirimelidae
(family not recorded from the area so far)
26b. Carapace transversely ovate; front narrow compared to maximum carapace width;
anterolateral margins of carapace strongly convex, each usually with well-defined teeth
or lobes (Fig. 49) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cancridae
broad front
narrow front
Fig. 48 Pirimelidae
Fig. 49 Cancridae
(after Christiansen, 1969)
(after Christiansen, 1969)
27a. Carapace triangular or hexagonal; front triangular, forked or spiniform; chelipeds usually
stout, very elongate (Fig. 50) . . . . . . . . . . . . . . . . . . . . . . . . . . . . Parthenopidae
27b. Carapace shape not as above; front usually truncate or multidentate; chelipeds usually
stout to slender, relatively short; if chelipeds long, usually slender . . . . . . . . . . . . . . . → 28
a)
(after Shen, 1932)
Fig. 50 Parthenopidae
b)