FAO Species Identification Guide for Fishery Purposes Western

1300 Sharks
9a. Snout bluntly rounded in dorsoventral
view; mouth arcuate, lower jaw with
convex edges (Fig. 9) . . . . . Triakis scyllium
(occurrence in the area uncertain)
9b. Snout parabolic to subangular in dorsoventral
view;mouth angular, lower jaw
with straight or nearly straight edges
(Figs 10 and 12) . . . . . . . (Mustelus) → 10
10a. No white spots on body; upper labial
furrows longer than lower furrows
(Fig. 10) . . . . . . . . . . . . . . . → 11
b) lateral view
Fig. 9 Triakis scyllium
10b. Numerous small white spots on dorsal surface of body; upper labial furrows subequal
to or shorter than lower furrows (Fig. 12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . → 12
11a. Interorbital space 3.6 to 4.5% of total length; teeth in both jaws with low cusps; precaudal
centra fewer, 73 to 80 (Fig. 10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mustelus griseus
11b. Interorbital space 5.6 to 6.0% of total length; teeth in both jaws with high cusps;
precaudal centra more numerous, 90 to 92 (Fig. 11) . . . . . . . . . . . . . . . . . Mustelus sp. A
a) ventral view
of head
b) lateral view
Fig. 10 Mustelus griseus
12a. Interorbital space relatively narrow,
3.7 to 4.5% of total length
(Fig. 12) . . . . . . . . . . . Mustelus manazo
12b. Interorbital space relatively broad,
6.1 to 7.1% of total length
(Mustelus antarcticus species
complex) . . . . . . . . . . . . . . . . . → 13
a) ventral view
of head
Fig. 11 Mustelus sp. A
(after Last and Stevens, 1994)
a) ventral view
of head
b) lateral view
13a. Total vertebrae 125 to 133; mono-
Fig. 12 Mustelus manazo
spondylous precaudal centra 34 to
37; precaudal centra 79 to 86; size
at maturity over 80 to 85 cm and reaching 1.75 m total length; temperate species
occurring from inshore to 350 m (Fig. 13) . . . . . . . . . . . . . . . . . . . . Mustelus antarcticus
13b. Total vertebrae 135 to 143; monospondylous centra 37 to 39; precaudal centra 88 to 95;
size at maturity over 70 cm and reaching 1.17 m total length; tropical species in deeper
water, 120 to 400 m (Fig. 14) . . . . . . . . . . . . . . . . . . . . . . Mustelus sp. B (eastern form)
13c. Total vertebrae 119 to 128, mostly less than 125; monospondylous centra 33 to 35;
precaudal centra 76 to 80; size at maturity about 60 cm and reaching 1.03 m total length;
tropical species in deeper water, 120 to 400 m (Fig. 14) . . . . . . . Mustelus sp. B (western form)
Fig. 13 Mustelus antarcticus
Fig. 14 Mustelus sp. B
(after Last and Stevens, 1994)