沖縄島中城湾から得られた日本初記録のダルマガレイ属魚類Engyprosopon mozambiquenseヨリメダルマガレイ（新称）とE. parvipectoraleキバヨリメダルマガレイ（新称）

抄録

Two species of lefteye flounder (Bothidae), Engyprosopon mozambiquense Hensley, 2003 and Engyprosopon parvipectorale Amaoka and Ho, 2018, are newly recorded from Japan based on five specimens (one male and four females) and a single male specimen, respectively, from Nakagusuku Bay, Okinawa Island, Ryukyu Islands. The two species resemble each other in sharing the following combination of characters: extremely narrow interorbital space; large mouth (posterior margin of ocular side upper jaw extending beyond anterior margin of lower eye); inner margin of gill rakers with serrae; and a pair of dark blotches on caudal fin absent. However, the present male specimen of E. mozambiquense differed from male specimens of E. parvipectorale from Taiwan and Japan in having a greater interorbital width, 11.5 in head length (vs. 23.1–67.7 in male E. parvipectorale), a rostral spine on the ocular side of the snout (vs. absent), and three dark blotches on the ventral surface of the ocular side lower jaw (vs. uniformly black). The present female specimens of E. mozambiquense were characterized by having small teeth on both jaws (vs. anterior teeth on the upper jaw, and all teeth on the lower jaw large and canine-like in both male and female E. parvipectorale). The two species are also similar to the Japanese endemic congener, Engyprosopon kushimotoense Amaoka, Kaga and Misaki, 2008 (known only from the male holotype from Wakayama Prefecture), and Engyprosopon longipelvis Amaoka, 1969 (known from southern Japan) in having gill rakers with serrae and a narrow interorbital space. However, E. kushimotoense and E. longipelvis differ from the former in having 43 and 37–42 lateral-line scales, respectively (vs. 49–52 in E. parvipectorale and 46–52 in E. mozambiquense). The new standard Japanese names “Yorime-darumagarei” and “Kiba-yorime-darumagarei” are proposed here for E. mozambiquense and E. parvipectorale, respectively.