Species: Mustelus whitneyi, Humpback smoothhound

Mustelus whitneyi Chirichigno, 1973

Humpback smoothhound

Elongate, hunched body; snout long; eyes horizontal ovals, with ventral nictitating membranes; width between eyes = 4.5-5.6% of TL;  mouth large, angular; teeth high, triangular, pointed, asymmetric;  top lip folds notably longer than bottom folds;  5 gill slits, last 2 over pectoral fin base; 2 large dorsal fins, second slightly smaller than first; first dorsal broadly triangular, its mid-base nearer pelvic base than pectoral base; dorsal fins with rear fibrous edge; distance between dorsal fin bases 16-21% of TL; first dorsal behind pectoral, center of its base nearer pelvic base than pectoral base; anal fin smaller than and with origin under middle of second dorsal; tail strongly asymmetrical, lower lobe with slightly concave rear edge in adults; skin denticles on flank elongate, single-pointed ovals, canal along entire center.

Grey above, paler below; fibrous rear edge of dorsal and tail fins dark.

Size: 87 cm.

Habitat: rocky bottoms around islands.

Depth: 15-210 m.

Temperate SE Pacific; Panama to Chile.