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Author: Bocage & Capello, 1864

Scymnodon ringens Bocage & Capello, 1864

Diagnosis: snout short, slightly over half mouth breadth, tapering smoothly from eye to rounded tip; inter-nostril distance approximately equal to distance from snout tip to line between inner corner of nostrils; deep pre-oral clefts extend slightly less than half distance to symphysis, labial furrows two-thirds as long as clefts. Upper teeth erect, lanceolate anteriorly, becoming progressively more oblique and curved outward posteriorly; lower teeth larger, first two curved inward, rest obliquely angled outward, cusps broadly triangular on quadrate base, notch present on outer side of base. Gill-slits relatively long, equal in size. First dorsal fin origin over appressed pectoral fin, spine short, exposed only at tip; second dorsal fin larger than first, free tip produced, extending to origin of upper caudal lobe; caudal fin very broad, tip broadly rounded, with a slight sub-terminal notch; posterior margin straight, lower lobe not differentiated. Denticles without transverse ridges. Colour: brown to black. Size: to 110 cm.

Habitat: benthic to mesopelagic, at 200-700 m. Food: fishes.

Distribution: eastern Atlantic northward from off Madeira and off Spain and Portugal to off Scotland. Elsewhere, from off Senegal.

Knifetooth dogfish (Scymnodon ringens)