頭部に長い分岐鰭條を有する珍奇なカレヒ類幼期に就て
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概要
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Among the planktonic organisms collected at the surface of the sea some 45 miles west of Amakusa Islands, Kiusiu, (32°21′N, 129°15′E) on August 6, 1935, by the research vessel "Misago-maru" of the Fisheries Experiment Station of the Government General of Chosen, I found a remarkable postlarva of a heterosomatous fish which is shown in the text figure. The fish measures 32.0mm in total length. The eyes still remain on the opposite sides of head, the right eye beginning its migration. Mouth small with several small pointed teeth developed on either side of both jaws. Vertebrae 43 in total number. Dorsal fin with 2 spines and 104 soft rays, its origin reaching forward to above tip of snout. Anal fin with 80 soft rays. First dorsal spine very short, Knob like. Second dorsal spine immensely elongated, a little longer than the total length of body, with five ribbon-shaped branches on the hinder margin of its stem. Pectoral fins broad, fan-shaped, their rays not yet developed. Ventral fins with six rays, the lift one situated on the abdominal ridge with its base longer than that of the right one. No scales nor lateral line have yet appeared. Melanophore groups are arranged on the lateral median line of body and on the elongated dorsal spine at the base of each branch as well as at the tip and basal part of its stem. On November 13, 1935, the same research vessel caught another postlarva having similar characteristics, off the mouth of Urusan Bay, southern Korea, (35°18′30″N, 129°26′30″E). This latter specimen is a little younger than the former, measuring 23mm in total length. Dorsal fin with 2 spines and 94 soft rays; anal 76 soft rays. Vertebrae 45. Melanophores similarly arranged. JOHN SCHMIDT collected a similar but a little different postlarva during his last expedition in the Indian Ocean, north-west to Madagascar, and gave its figure in his narrative of the cruise (Dana's Togt omkling Jorden 1928-1930, 1932, p.277, fig.215). This postlarva, measuring some 50mm in total length, differs chiefly in that the elongated dorsal spine has seven branches instead of five in my specimens. No identification was given in the above book. I have provisionally identified these postlarvae before me as Psettina ijimae (JORDAN et STARKS), though the identification involves a certain degree of uncertainty. Sinistrality of form, far advanced position of the origin of dorsal fin and the position and size of the left ventral fin show these postlarvae to belong to the family Bothidae. As to the generic or specific identification much perplexity exists. I have chiefly relied upon the number of fin rays and the size of mouth. The known and already identified postlarval forms of the heterosomatous fishes have been compared and used for the elimination of the genera or species known to be distributed in the related regions. Anyhow, further knowledge about the more advanced stages are necessary to settle the problem.
- 社団法人日本動物学会の論文
- 1936-10-15
著者
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