Siphonogobius nue, a new genus and species of gobiid fish from japan |
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Authors: | Koichi Shibukawa Akihisa Iwata |
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Institution: | (1) Laboratory of Ichthyology, Tokyo University of Fisheries, 4-5-7 Konan, Minato-ku, 108-8477 Tokyo, Japan;(2) Biological Laboratory, Imperial Household Agency, 1-1 Chiyoda, Chiyoda-ku, 100-0001 Tokyo, Japan |
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Abstract: | A new genus and species of gobiid fish,Siphonogobius nue, based on 15 specimens, is described from temperate Pacific coasts of Japan. It is unique amongst gobioids in having a simple
tube-like infraorbital canal extending below the eye and the oculoscapular canal between pores A' and L' without openings,
except for the terminal pores and pore D. Although well-developed infraorbital canals occur in two other gobioid genera, the
rhyacichthyidRhyacichthys and the gobiidLophiogobius, such are distinct from that ofSiphonogobius in having several branches and openings. Furthermore, the new taxon is distinguished from all other gobioids by the following
combination of characters: first dorsal-fin spines 7–9 (usually 8); pectoral-fin rays 24–26, the upper 7–9 rays free from
the fin membrane; pelvic frenum thick, robust and slightly emarginate posteriorly; scales small and cycloid, 87–96 in longitudinal
series; vertebrae 14–15+19–20=33–34 (usually 14+20=34); P-V usually 3/I II II I I I 0/11; anal-fin pterygiophores anterior
to the first haemal spine 3–4 (usually 3); a row of short fleshy flaps on the ventral surface of the head, extending from
the lower edge of the preopercle to the chin; anterior nostril with a minute skin flap. Axial skeletal features indicated
thatSiphonogobius is closely related to a group which includesAcanthogobius and its relatives. |
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Keywords: | Siphonogobius nue new genus and species Gobiidae “ Acanthogobius Group” Japan |
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