奄美群島加計呂麻島から採集された日本初記録の イットウダイ科魚類<i>Sargocentron iota</i> コガシラエビス（新称）

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書誌事項

タイトル別名
  • First Japanese record of <i>Sargocentron iota</i> (Beryciformes: Holocentridae) from Kakeroma Island, Amami Islands, Japan
  • 奄美群島加計呂麻島から採集された日本初記録のイットウダイ科魚類Sargocentron iotaコガシラエビス(新称)
  • アマミ グントウカケイロマトウ カラ サイシュウ サレタ ニホン ハツ キロク ノ イットウダイカギョルイ Sargocentron iota コガシラエビス(シンショウ)

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抄録

<p>To clarify the ichthyofauna of the Amami Island Ryukyu Archipelago, fish specimens from the region were examined in museums throughout Japan resulting in the discovery of a single specimen (75.9 mm standard length; SL) of the dwarf squirrelifish Sargocentron iota Randall, 1998 (Beryciformes, Holocentridae) in the Yokosuka City Museum. Collected from a deep (23m) dark recess in a rocky reef grotto at a rocky reef off Kakeroma Island. The specimen was characterized by XI, 13 dorsal-fin rays, IV, 9 anal-fin rays, 15 pectoral-fin rays, I, 7 pelvic-fin rays, 6 + 10 + 9 + 5 caudal-fin rays, 45 lateral-line scales, 3.5 scale rows between the mid base of the spinous dorsal fin and the lateral line, 9 scale rows between the lateral line and anal-fin origin, 4 oblique scale rows on the cheek, 5 + 10 gill rakers, 11 + 16 vertebrae, body depth 2.5 in SL, head length 2.7 in SL, head depth 3.6 in body depth, snout length less than half orbital diameter, upper-jaw length 2.6 in head length, fourth dorsal-spine longest, third dorsal-fin soft ray longest, a pair of retrorse spines on the edge of the premaxillary groove, a spine on the upper edge of the lacrimal absent, and a bright red body coloration when fresh. The longest anal-fin soft ray length of the Kakeroma Island specimen was slightly shorter than that of the type specimens of S. iota which is likely to be an individual or geographic variation. Although S. iota is distributed in the Indo-Pacific, it has been recorded only from the Hawaiian Islands and Palau within the North Pacific Ocean. Accordingly, the Kakeroma Island specimen represents the first record of S. iota from Japanese waters and the northernmost record for the species. The new standard Japanese name “Kogashira-ebisu” is proposed for the species.</p>

収録刊行物

  • 魚類学雑誌

    魚類学雑誌 66 (1), 1-5, 2019-04-25

    一般社団法人 日本魚類学会

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