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Characteristics, distribution and ecology
Taxonomische classification
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Author: Pietschmann, 1928

Field Marks:
No anal fin, dorsals spineless and far back, first behind pelvic origins; denticles relatively close-set and only moderately large, not formed as large, flat thorns.

Diagnostic Features:
Dermal denticles on body moderate-sized, close-set, and with relatively small, stellate bases, less than 5 mm in diameter; denticles not expanded into large bucklers or thorns, not fused together.

Geographical Distribution:
Western Pacific: Taiwan (Province of China), New Zealand. Central Pacific: Palau (Belau) and HawaiianIslands. Eastern Pacific: Central California to Gulf of California, also Peru.

Habitat and Biology:
A large, sluggish bottom shark, occurring on continental and insular shelves and upper slopes at depths from 11 to at least 424 m; in California caught in submarine canyons. Eats a variety of fishes, including spiny dogfish, the young of the sixgill shark (Hexanchus-griseus), hake, flounders, rockfish, lingcod, topsmelt, herring, elephantfish (Callorinchus), and catshark (Apristurus) eggeases, also octopuses and squids.

Maximum about 4 m, size at birth below 45 cm, mature males reaching at least 220 cm, females immature at 254 cm and adult at 299 cm (sex not reported for 4 m specimen).

Interest to Fisheries:
Unimportant, occasionally taken by line gear, gillnets and bottom trawls.

Type material:
Holotype: Formerly in Bernice P. Bishop Museum, Oahu, Hawaiian Islands, apparently lost. Type Locality South coast of Kauai, Hawaiian Islands. Neotype: National Museum of New Zealand, NMNZ 2774, Pallaser Bay, Cook Strait, New Zealand, designated by Garrick (1960:110).

Prickly shark (Echinorhinus cookei)