sentences:  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").