The longfin sawtail catshark (Galeus cadenati) is a rare, little-known species of catshark, part of the family Scyliorhinidae. Once thought to be a subspecies of the roughtail catshark (G. arae) along with the Antilles catshark (G. antillensis), it inhabits deep water off the Caribbean coasts of Panama and Colombia. This slim-bodied species has a marbled dorsal color pattern and a prominent crest of enlarged dermal denticles along the dorsal edge of its caudal fin. It can be distinguished from similar species by its relatively longer anal fin and small adult length of under . The longfin sawtail catshark is oviparous. Taxonomy Renowned shark expert Stewart Springer described the longfin sawtail catshark in a 1966 issue of the United States Fish and Wildlife Service Fishery Bulletin, based on a long female collected off Panama on May 30, 1962. He named the species after French zoologist Jean Cadenat, who described the similar African sawtail catshark (G. polli). Springer and other authors would subsequently come to regard G. cadenati as a subspecies of the roughtail catshark (G. arae). In 1998 and 2000, Hera Konstantinou and colleagues published revisions of the G. arae species complex in which they elevated G. a. cadenati back to the rank of full species, along with the other subspecies G. a. antillensis. Distribution and habitat The longfin sawtail catshark does not co-occur with either G. arae or G. antillensis. It has only been found in the Caribbean Sea off Panama and Colombia, though confusion with its sister species could have obscured the full extent of its distribution. Demersal in nature, it is a rare inhabitant of the upper continental slope, at depths of . Description The longfin sawtail catshark reaches a maximum known length of , smaller than G. antillensis and comparable to G. arae. This species is slender, with a broad head and a moderately long, pointed snout. The large eyes are horizontally oval, equipped with rudimentary nictitating membranes (protective third eyelids), and lack prominent ridges underneath. A modest spiracle is located behind each eye. The nostrils are large and partially covered by anterior triangular flaps of skin. The mouth is wide and curved, with fairly long furrows around the corners. The teeth have a long central cusp flanked on either side by one or two pairs of lateral cusplets. The upper jaw of the type specimen contained 62 tooth rows. The five pairs of gill slits are