An order of sharks (bramble sharks) represented by one family, one genus, and two species. The family (Echinorhinidae) differs from all other sharks in possessing the following combination of characters: body and fins covered with thornlike denticles; two small spineless dorsal fins placed posteriorly to the pelvic fin origin; anal fin lacking; minute spiracles placed well behind the eyes; teeth similar in both jaws; and caudal fin without a subterminal notch. Maximum length is 2 m (6.6 ft).