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Teleostei > Atheriniformes (Silversides) 銀漢魚目 (Silversides) > Bedotiidae (Madagascar rainbowfishes) 皮杜銀漢魚科 (Madagascar rainbowfishes)
Etymology: Rheocles:Greek, rheos = stream + Greek, kles, kleis = straits; derhami:Named for Patrick de Rham, director of the Aquatic Conservation Network (Ref. 39832). Eponymy: Dr Patrick Henri de Rham (d: 1936) is a Swiss zoologist, botanist, ichthyologist and aquarist in Lausanne, and was Expert Ecologist to the Coopération Technique Suisse. He is a Director of the Aquatic Conservation Network. (Also see Patrick and Rham) (Ref. 128868), visit book page.
背棘 (總數) : 2; 背的軟條 (總數) : 14 - 19; 臀棘: 1; 臀鰭軟條: 15 - 21; 脊椎骨: 35 - 38. Rheocles derhami is readily distinguished from R. sikorae and R. wrightae by length of upper jaw (32-41%HL versus 46-58) and absence of black pigmentation of genital papilla, from R. pellegrini by number of gill rakers on lower limb of first arch (9-10 versus 6-7), from R. lateralis by caudal peduncle length (67.3-78.6%SL versus 84.6-96.7), and from R. alaotrensis by absence of chest and belly scales and paired predorsal scale rows (Ref. 39832). In life males normally light grey, the second dorsal, anal and caudal fins are bright silvery blue, the throat region is orange-red, light grey females are not brightly colored; preserved specimens are creamy yellow, scale rows in dorsal midline heavily pigmented and darkened (Ref. 39832). Body shape (shape guide): fusiform / normal. Rheocles derhami 輕易地被區分 R. sikorae 與 上頜 (32-41% HL 對 46-58) 的長度 R. wrightae 而且缺乏生殖乳突的黑色顏色, 從 鰓耙的數字的 R. pellegrini 在第一鰓弓 (9-10 和 6-7 比較) 的下肢上, 從 尾柄長度 (67.3-78.6%SL 對 84.6-96.7) 的 R. lateralis, 與從 R. alaotrensis 被缺乏胸與腹面鱗片與成對的前背鱗片列.(參考文獻 39832) 活著時雄性通常淡灰色, 第二個背鰭、臀鰭與尾鰭是明亮的銀藍色, 咽喉區域是橘紅色又淡灰色的雌性不是色彩鮮豔的; 保存的標本是乳脂色的黃色, 在背部中線的鱗片列顏色深的而且顏色較深。 (參考文獻 39832)
Stiassny, M.L.J. and D.M. Rodriguez, 2001. Rheocles derhami, a new species of freshwater rainbowfish (Atherinomorpha: Bedotiidae) from the Ambomboa River in northeastern Madagascar. Ichthyol. Explor. Freshwat. 12(2):97-104. (Ref. 39832)
