Fossil record of a silurid catfish from the Middle Miocene Sanuki Group of Ohkawa, Kagawa Prefecture, Japan |
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| Authors: | Katsutoshi Watanabe Teruya Uyeno Shigeru Mori |
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| Institution: | (1) Laboratory of Ichthyology, Tokyo University of Fisheries, 4-5-7 Konan, Minato-ku, 108-8477 Tokyo, Japan;(2) Present address: Department of Marine Bioscience, Fukui Prefectural University, 1-1 Gakuen-cho. Obama, 917-0003 Fukui, Japan;(3) National Science Museum, 3-23-1 Hyakunin-cho, Shinjuku-ku, 169-0073 Tokyo, Japan;(4) Tahl Elementary School, 902-2 Tahi-kami-machi, Takamatsu, 761-8076 Kagawa, Japan |
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| Abstract: | A fossil specimen identified as a silurid catfish (92.5 mm SL) was collected from the Middle Miocene Sanuki Group (15.8±0.9
Ma) of Ohkawa, Kagawa Prefecture, Japan. This is the oldest certain record of a silurid catfish. Morphological characteristics
of the specimen are as follows: 52 or 53 vertebrae, 61 or 62 anal fin rays, a stout, short spine (11%SL) and 10 or more soft
rays of the pectoral fin, 8 or more pelvic fin rays, 8 or more branchiostegal rays, head length of ca. 24%SL, and most probably
not forked caudal fin. The fossil specimen is clearly distinct from three extant silurids in Japan, and probably belongs to
an undescribed form considering its geological age. |
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| Keywords: | Siluriformes Siluridae fossil catfish Miocene Sanuki Group |
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