琉球列島より得られたテッポウエビ類と共生するハゼ科3種の記録

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Three shrimp-associated gobies, Cryptocentrus fasciatus, Flabelligobius russus and Flabelligobius smithi, were recently collected from Iriomote-jima Island, Yaeyama Islands of the Ryukyu Archipelago, Japan. Their occurrences represent the first record from Japanese waters and, also, the northernmost record for these species. Morphological features of the Japanese specimens of these species are described. F. russus has been frequently placed in Cryptocentrus in previous literature, but the species has a longitudinal pattern of sensory-papillae rows on the cheek (vs. distinct transverse pattern in Cryptocentrus), a uniserial transverse row of sensory papillae just behind the chin (vs. a pair of short longitudinal rows of sensory papillae), and the well-developed membrane between ventral arm of first gill arch and inner surface of buccal cavity (vs. not developed), characters which agree with the current diagnosis of Flabelligobius. The Japanese specimen of F. smithi has an intermediate condition between F. smithi (previously known only by three specimens from Taiwan) and its closest congener, F. fourmanoiri (known only by the holotype from Madagascar), in some proportional measurements and meristic counts. The Japanese specimen is, however, provisionally identified here as F. smithi, judging from other diagnostic characters listed in the original description (e.g., number of pectoral-fin rays and configuration of sensory-papillae rows on cheek) and by a new character: elongation of first dorsal-fin spines, viz., anterior two spines elongate and filiform in F.fourmanoiri vs. only a single (=first) spine elongate in F. smithi.
国立科学博物館の論文
2005-12-22

琉球列島より得られたテッポウエビ類と共生するハゼ科3種の記録

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