著者

和田 英敏 福地 伊芙映 宮本 圭 立原 一憲 本村 浩之

出版者

日本動物分類学会

雑誌

タクサ:日本動物分類学会誌 (ISSN:13422367)

巻号頁・発行日

vol.49, pp.67-73, 2020

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<p>Two specimens (67.5–75.1 mm standard length; SL) of <i>Plectranthias maekawa</i> Wada, Senou and Motomura 2018 (Serranidae: Anthiadinae), previously recorded only the Tokara Islands, Kagoshima Prefecture, Japan, were collected from Okinawa-jima and Yonaguni-jima islands, Okinawa Prefecture, Japan. The present specimens, described herein in detail, represent the first records of the species from Okinawa Prefecture. Although the body depth (% of SL) has been regarded as one of diagnostic characters between <i>P</i>. <i>maekawa</i> and two closely-related congeners (<i>Plectranthias helenae</i> Randall, 1980 and <i>Plectranthias wheeleri</i> Randall, 1980) in the original description of <i>P</i>. <i>maekawa</i>, that of the present new specimens was overlapped with the latter two species (viz., 33.5–37.7% of SL in <i>P</i>. <i>maekawa</i>, 35.5–38.7% SL in <i>P</i>. <i>helenae</i>, and 35.6–37.9% of SL in <i>P</i>. <i>wheeleri</i>). The number of serration on the margins of subopercle and interopercle in <i>P</i>. <i>wheeleri</i> and <i>P</i>. <i>maekawa</i> has also been regarded as a diagnostic character for the two species, but additional specimens described in this study showed that the number of serration changed ontogenetically, and it overlapped in the similar-sized specimens of the two species. However, the validities of other diagnostic characters given in the original description of <i>P</i>. <i>maekawa</i> are reconfirmed in this study (viz., number of pectoral-fin rays, scales on above and below lateral line, morphometrics of body width, head length, third dorsal-fin spine length, caudal-peduncle length and depth, and both coloration of fresh and preserved conditions). In addition, three specimens of <i>P</i>. <i>wheeleri</i> (71.3–83.7 mm SL) from the Okinawa Islands, are reported here as the first records of the species from Okinawa Prefecture; it has been previously recorded from Japan (Sagami Bay, and Tokara and Amami islands), Taiwan, Indonesia, and Australasia.</p>