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aqua 13(2)_Two n. sp. of Trimma

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SINGLE PAPER

Volume 13, Issue 2 – 8 November 2007

Richard Winterbottom and Laura Southcott: Two new species of the genus Trimma (Percomorpha: Gobiidae) from western Thailand, pp. 69-76

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SINGLE PAPER

Volume 13, Issue 2 – 8 November 2007

Richard Winterbottom and Laura Southcott: Two new species of the genus Trimma (Percomorpha: Gobiidae) from western Thailand, pp. 69-76

Abstract
Two new species of the genus Trimma are described. Trimma fucatum is characterized by the presence of predorsal scales, two opercular scales (one ctenoid, one cycloid), an interorbital and a slight postorbital trench, no elongate dorsal spines, and one dichotomous branch in the fifth pelvic-fin ray. When alive, T. fucatum has three to four diffuse rows of orange to yellow blotches, smaller yellow spots on the caudal fin, and a distinctive narrow red bar on the preopercle. Preserved specimens have straw-yellow blotches on a brown background. Trimma sanguinellus is characterized by a lack of predorsal and opercular scales, the presence of interorbital trenches, a slightly elongate second dorsal spine, a fleshy ridge on the predorsal midline, and an unbranched fifth pelvic-fin ray. Freshly-caught specimens are uniformly red-orange. Specimens preserved in ethanol are straw-yellow. Both new species are currently known only from the eastern margin of the Indian Ocean.

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