Nomorhamphus rex, a new…

Nomorhamphus rex, a new species of viviparous halfbeak, is described from three small  rivers in Sulawesi Selatan, Indonesia. The new species differs from all other Nomorhamphus in anal-fi n morphology of adult males. The third or fourth segment of the second anal-fi n ray is composed of two rows of subsegments, giving the third or fourth segment the appearance of being split into two rays. The spiculus is curved dorsally and contacts the distal segments of the third anal-fi n ray with its proximal and middle segments; the distal segments are curved ventrally, giving the spiculus a sickle-like shape. Appearance and colouration of Nomorhamphus rex are similar to N. kolonodalensis and N. ebrardtii, from which it is distinguished by the shape of the andropodium and in having a relatively longer lower jaw. This description brings the number of Nomorhamphus endemic to Sulawesi to ten.