A new species of the genus Trimma (Percomorpha; Gobiidae) from Helen Reef, South-West Islands of Palau
aqua, International Journal of Ichthyology, pp. 109-116, Volume 15, Issue 2 – 15 April 2009
A new species of the genus Trimma is described based on 41 specimens from the southern tip of Helen Reef, SW Islands of Palau. Trimma hotsarihiensis n. sp. is characterized by the absence of scales in the predorsal midline, no cheek or opercular scales, a broad U-shaped interorbital trough and a slit-like postorbital trench, a fleshy ridge, the dermal crest, in the dorsal midline extending from the first spine of the dorsal fin and decreasing in height anteriorly, reaching to a vertical above the vertical limb of the preopercle, no elongate dorsal spines, usually 9 dorsal-fin rays, 17 pectoral-fin rays with 6-12 of the inner rays branched, and an unbranched fifth pelvic-fin ray. When freshly collected, T. hotsarihiensis is yellow with small yellow spots on the caudal fin, a black basal stripe in the dorsal and anal fins bordered distally by an approximately equalwidth yellow stripe in the dorsal fins and rest of anal fin yellow, a short, diffuse, irregular dark stripe extending posteriorly from immediately above the opercle, and a dark, pupilwidth, internal band extending along the midline from the occipital region, tapering out at the end of the caudal peduncle. Preserved specimens are straw-yellow, with the dark external stripes in the dorsal and anal fins and above the opercle, and, usually, the dark internal bar, still visible. Trimma hotsarihiensis is currently known only from Helen Reef just north of the equator in the western Pacific Ocean.
AKIHITO, SAKAMOTU, K., IWATA, A. & IKEDA, Y. 1993. Cephalic sensory organs of the gobioid fishes. In: Fishes of Japan with pictorial keys to the species. (Ed. T. Nakabo). Tokai Univ. Press, Tokyo, Japan [In Japanese], pp 1088-1116.
AKIHITO, SAKAMOTO, K., IKEDA, Y. & SUGIYAMA, K. 2002. Gobioidei. In: Fishes of Japan with pictorial keys to the species. (Ed. T. Nakabo). English edition, Vol. II, Tokai University Press, Tokyo, pp 1139-1310; 1596-1619.
LEVITON, A. E., GIBBS, R. H JR., HEAL, E. & DAWSON, C. E. 1985. Standards in Herpetology and Ichthyology. Part 1: standard symbolic codes for institutional resource collections in herpetology and ichthyology. Copeia, 1985(3): 802-832.
SARUWATARI, T., LOPEZ, J. A. & PIETSCH, T. W. 1997. Cyanine blue: a versatile and harmless stain for specimen observation. Copeia 1997 (4): 840-841.
SANZO, L. 1911. Distribuzioine delle papille cutanee (organi ciatiformi) e suo valore sistematico nei Gobi. Mitteilungen aus der Zoologischen Station zu Neapel 20 (2): 251-328.
SUNOBE, T. & NAKAZONO, A. 1990. Polygynous mating system of Trimma okinawae (Pisces: Gobiidae) at Kagoshima, Japan with a note on sex change. Ethology 84: 133-143.
SUZUKI, T. & SENOU, H. 2008. Two new species of the gobiid fish genus Trimma (Perciformes: Gobioidei) from Southern Japan. Bulletin of the National Museum of Natural Science, Series A Supplement 2: 97-106.
WINTERBOTTOM, R. 2002. Two new species of Trimma (Gobiidae) from the central, western, and south Pacific. aqua, Journal of Ichthyology and Aquatic Biology 5 (2): 45-52.
WINTERBOTTOM, R. 2003. A new species of the gobiid fish Trimma from the Western Pacific and Northern Indian Ocean coral reefs, with a description of its osteology. Zootaxa 218: 1-24.
WINTERBOTTOM, R. & SOUTHCOTT, L. (2008) Short lifespan and high mortality in the western Pacific coral reef goby Trimma nasa. Marine Ecology Progress Series 366: 203-208.
WINTERBOTTOM, R. & ZUR, M. 2007. Three new species of the Trimma from Palau, Western Pacific (Percomorpha; Gobiidae). aqua, International Journal of Ichthyology 13 (1): 13-24.