The longnose sawtail catshark (Galeus longirostris) is a little-known species of catshark, part of the family Scyliorhinidae, found off the northwestern Pacific islands of Amami Ōshima, Ogasawara, and Izu at depths of . Reaching a length of , it is characterized by a long flattened snout, a long space between the pelvic and anal fins, and a crest of enlarged dermal denticles along the dorsal caudal fin edge. Adults are plain dark gray above, while juveniles have a few faint dark saddles on the back and tail. Taxonomy The first known specimen of the longnose sawtail catshark was hooked on a bottom longline off the Ogasawara Islands in 1983. The new species was described by Hiroyuki Tachikawa and Toru Taniuchi in a 1987 issue of the Japanese Journal of Ichthyology, and given the specific epithet longirostris from the Latin longus ("long"), and rostrum ("snout"). A long female caught off Amami Ōshima was designated as the type specimen. Within the genus, this species most closely resembles the broadfin sawtail catshark (G. nipponensis). Distribution and habitat The longnose sawtail catshark has been recorded from south of Japan, off the islands of Amami Ōshima, Ogasawara, and Izu. This demersal species inhabits upper insular slopes at a depth of , and is reportedly rather common. Description One of the larger members of the genus, the longnose sawtail catshark grows to at least long. This species has a rather stout body and a flattened head. The snout is notably long, with a rounded tip. The nostrils are large and divided by triangular skin flaps on their anterior rims. The large, horizontally oval eyes are equipped with rudimentary nictitating membranes (protective third eyelids) and have thin ridges underneath. There is a medium-sized spiracle behind each eye. The mouth forms a wide arch and bears well-developed furrows around the corners. The tooth rows number 60–70 in either jaw; each tooth is small, with a narrow central cusp and 3–6 smaller lateral cusplets. The five pairs of gill slits are short, with the fifth pair over the pectoral fin bases. The origins of the first and second dorsal fins lie over the latter half of the pelvic fins and the midpoint of the anal fin respectively. The dorsal fins are roughly triangular with blunt apexes, with the first slightly larger than the second. The large, wide pectoral fins have rounded corners. The pelvic fins are of moderate size;