FAO Species Identification Guide for Fishery Purposes Western

Squalidae 1219
24a. Free rear tips of pectoral fins moderately elongated and attenuated, not extending
behind first dorsal-fin spine; postdorsal space short, about 6% of total length; cusps of
lateral trunk denticles acutely angular in adults; body colour dark grey (Fig. 31) . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Centrophorus niaukang
24b. Free rear tips of pectoral fins greatly elongated, usually extending well behind first dorsal
spine; postdorsal space longer, about 7.5 to 8% of total length; cusps of lateral trunk
denticles obtusely angular to absent in adults; body colour medium to light grey . . . . . . . . → 25
25a. First dorsal fin greatly elongated, base about 1.6 to 2 times base of second dorsal fin
and over 16% of total length; postventral caudal margin nearly straight in adults (Fig. 32)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Centrophorus lusitanicus
(occurrence in the area uncertain)
25b. First dorsal fin moderately elongated, base about 1.3 times base of second dorsal fin
and less than 16% of total length; postventral caudal margin deeply notched in adults
(Figs 33 and 34) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . → 26
Fig. 31 Centrophorus niaukang
26a. Adults with tips of dorsal fins dusky, not prominently marked (Fig. 33) . . Centrophorus granulosus
26b. Adults with tips of dorsal fins black, prominently marked from base of fins (Fig. 34)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Centrophorus atromarginatus
27a. Lower teeth with comparatively low, more or less oblique cusps; denticles on sides of
body smooth, without ridges (Fig. 35) . . . . . . . . . . . . . . . . . . . Centroscymnus coelolepis
27b. Lower teeth with comparatively high, more or less erect cusps; denticles on sides of
body with cross-ridges as well as transverse ridges (Fig. 36) . . . . . . . Scymnodon squamulosus
28a. Upper teeth with 4 or 5 pairs of
cusplets on each side (Fig. 37)
. . . . . . . . . . Etmopterus decacuspidatus
(occurrence in the area uncertain)
28b. Upper teeth usually with 3 or
fewer pairs of cusplets on each
side . . . . . . . . . . . . . . . . . . . . → 29
long
Fig. 32 Centrophorus lusitanicus
Fig. 33 Centrophorus granulosus Fig. 34 Centrophorus atromarginatus
Fig. 35 Centrophorus coelolepis Fig. 36 Scymnodon squamulosus
upper
tooth
Fig. 37 Etmopterus decacuspidatus