5: SQUALIDAE (DOGFISHES)
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:{)\'O ~
"'0 ' - d
T
5.5 Centroscyllium fabricii: 64 cm (N . Atlantic; after Bigelow & Schroeder, 1948). T & d as in 2.1.
Genus Centroscyllium Muller & Henle, 1841
Dorsal fin spines well developed with 2 shallow longitudinal grooves on each side; inner corner ofP rounded. Newborn pups naked, the denticles developing first along the
back, spreading later to sides and then to lower surface.
Deep-water (275 -1100 m) sharks represented in all oceans.
Five species; only 1 in our area.
5.5 Centroscyllium fabricii
(Reinhardt, 1825)
Spinax fabricii Reinhardt, 1825: 3 (West Greenland). Centroscyllium
fabricii: Bass et aI., 1976: 21*.
Distance from base of 2nd D to origin of C subequal to that from eye to
1st gill slit.
Adults uniformly blackish; fins of juveniles with white
margins. Born at about 16 cm; males mature at about 60 cm;
attains 83 cm. Reported from North Atlantic to depths of
1100 m and off Walvis Bay in 605 - 625 m.
Genus Centroscymnus Socage & Capello, 1864
Dorsal fin spines small, mostly or entirely covered by
skin. Teeth unicuspid; uppers along middle of jaw slender,
with erect cusps. Inner corner of P rounded. Our definition
of this genus includes those species previously assigned to
Scymnodon. The trivial tooth differences supposed to separate these 2 genera are invalidated by the sexual dimorphism in tooth shapes (Garrick, 1959; Pinchuk & Permitin,
1970). The difference in denticle sculpturing used by Garrick (1959) to separate the 2 groups is also obscured by
intra- and inter-specific variation. About 11 species; 2 in our
area.
KEY TO SPECIES
la Pre· oral grooves long, almost meeting in front of
mouth; denticles without cross·striations ................. C. crepidater
1 b Pre·oral grooves short, separated by a distance equal
to twice that between nostrils; denticles with distinct
cross· striations joining the 3 longitudinal ridges .......... C. obscurus
5.6 Centroscymnus crepidater
(Socage & Capello, 1864)
Centrophorus crepidater Bocage & Capello, 1864: 262 (off Portugal).
Centroscymnus crepidater: Bass et aI., 1976: 33*. Centroscymnus owstoni
(non Garman, 1906; specimens in British Museum examined for us by
A. Wheeler): Forster et aI., 1970: 394.
Distance between inner ends of pre·oral grooves about V3 inter·nostril
distance; snout length greater than head width at orbits; distance from
snout tip to level of P origins 21·26% TL.
Dark grey in colour. Attains 130 cm. Eastern North Atlantic, New Zealand and tropical western Indian Ocean; reported from off Walvis Bay in 605 - 625 m.
5.6 Centroscymnus crepidater: 90 cm female (New Zealand; after Garrick, 1959). T & d as in 2.1.
52
()
:{)\'O ~
"'0 ' - d
T
5.5 Centroscyllium fabricii: 64 cm (N . Atlantic; after Bigelow & Schroeder, 1948). T & d as in 2.1.
Genus Centroscyllium Muller & Henle, 1841
Dorsal fin spines well developed with 2 shallow longitudinal grooves on each side; inner corner ofP rounded. Newborn pups naked, the denticles developing first along the
back, spreading later to sides and then to lower surface.
Deep-water (275 -1100 m) sharks represented in all oceans.
Five species; only 1 in our area.
5.5 Centroscyllium fabricii
(Reinhardt, 1825)
Spinax fabricii Reinhardt, 1825: 3 (West Greenland). Centroscyllium
fabricii: Bass et aI., 1976: 21*.
Distance from base of 2nd D to origin of C subequal to that from eye to
1st gill slit.
Adults uniformly blackish; fins of juveniles with white
margins. Born at about 16 cm; males mature at about 60 cm;
attains 83 cm. Reported from North Atlantic to depths of
1100 m and off Walvis Bay in 605 - 625 m.
Genus Centroscymnus Socage & Capello, 1864
Dorsal fin spines small, mostly or entirely covered by
skin. Teeth unicuspid; uppers along middle of jaw slender,
with erect cusps. Inner corner of P rounded. Our definition
of this genus includes those species previously assigned to
Scymnodon. The trivial tooth differences supposed to separate these 2 genera are invalidated by the sexual dimorphism in tooth shapes (Garrick, 1959; Pinchuk & Permitin,
1970). The difference in denticle sculpturing used by Garrick (1959) to separate the 2 groups is also obscured by
intra- and inter-specific variation. About 11 species; 2 in our
area.
KEY TO SPECIES
la Pre· oral grooves long, almost meeting in front of
mouth; denticles without cross·striations ................. C. crepidater
1 b Pre·oral grooves short, separated by a distance equal
to twice that between nostrils; denticles with distinct
cross· striations joining the 3 longitudinal ridges .......... C. obscurus
5.6 Centroscymnus crepidater
(Socage & Capello, 1864)
Centrophorus crepidater Bocage & Capello, 1864: 262 (off Portugal).
Centroscymnus crepidater: Bass et aI., 1976: 33*. Centroscymnus owstoni
(non Garman, 1906; specimens in British Museum examined for us by
A. Wheeler): Forster et aI., 1970: 394.
Distance between inner ends of pre·oral grooves about V3 inter·nostril
distance; snout length greater than head width at orbits; distance from
snout tip to level of P origins 21·26% TL.
Dark grey in colour. Attains 130 cm. Eastern North Atlantic, New Zealand and tropical western Indian Ocean; reported from off Walvis Bay in 605 - 625 m.
5.6 Centroscymnus crepidater: 90 cm female (New Zealand; after Garrick, 1959). T & d as in 2.1.
52