FAO Species Identification Guide for Fishery Purposes Western

Squalidae 1217
15a. Dorsal-fin spines slender (Fig. 19); a dark bar along base of lower caudal-fin lobe
(Fig.19), more prominent in juveniles; denticle crowns without lateral keels (Fig. 17b);
precaudal vertebrae mostly 94 to 96 . . . . . . . . . . . . . . . . . . . . . . . . . . Squalussp. A
15b. Dorsal-fin spines robust (Fig. 20); no dark bar on base of lower caudal-fin lobe (Fig. 20);
denticle crowns with lateral keels (Fig. 17c); precaudal vertebrae 90 to 93 . . . . . . Squalus sp. B
Fig. 19 Squalus sp. A Fig. 20 Squalus sp. B
16a. Upper teeth with slender primary cusp and 1 or more cusplets on each side (Fig. 21b);
second dorsal fin noticably larger than first . . . . . . . . . . . . . . . . . . . . (Etmopterus) → 28
16b. Upper teeth with slender to thick primary cusps but with no cusplets; second dorsal fin
as large or noticably smaller than first . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . → 17
17a. Snout greatly elongated, its length greater than distance from centre of mouth to
pectoral-fin origins (Fig. 22a); dermal denticles of back pitchfork-shaped, crowns on tall,
slender pedicels (Fig. 22b) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (Deania) → 18
17b. Snout short to moderately elongated, its length equal or usually less than distance from
centre of mouth to pectoral-fin origins; dermal denticles with short pedicels and broad
crowns, not pitchfork-shaped . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . → 20
cusplets
primary
a) upper teeth b) lower teeth
cusp
Fig. 21 Etmopterus
18a. A subcaudal keel on the lower
surface of the caudal peduncle
(Fig. 23) . . . . . . . . . Deania profundorum
18b. No subcaudal keel on the lower
caudal peduncle (Figs 24 and 25) . . . . . →19
a) ventral view of head
b) dermal denticle
19a. First dorsal fin rather high, angular, and short, distance from its spine origin to its free tip
about 2/3 of distance from rear origin of second dorsal-fin spine to free rear tip of its fin
(Fig. 24) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Deania quadrispinosa
19b. First dorsal fin rather low, rounded, and long, distance from its spine origin to its free rear
tip greater than distance from origin of second dorsal-fin spine to free rear tip of its fin
(Fig. 25) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Deania calcea
a
b
Fig. 22 Deania
Fig. 23 Deania profundorum
Fig. 24 Deania quadrispinosum Fig. 25 Deania calcae
keel