Two New Species Of Viviparous Halfbeak (Atherinomorpha: Beloniformes: Zenarchopteridae) Endemic To Sulawesi Tenggara, Indonesia

Two new viviparous species of the zenarchopterid genus Nomorhamphus are described from Sulawesi Tenggara, Indonesia. The two new species are allopatric, share the same anal-fin morphology of adult males, but differ clearly in the length of the lower jaw and by features of fin pigmentation. Nomorhamphus lanceolatus, new species, and N. sagittarius, new species, are distinguished from all other congeners by a lanceolate, dorsally slightly curved spiculus in the male andropodium and by presence of a distinct black spot on the base of the pectoral fin. Nomorhamphus lanceolatus, from the Sampara river basin at the west coast of south-east Sulawesi, is further distinguished from congeners by its conspicuously short (15.0–25.3 times in SL) lower jaw, and black pigmentation in dorsal and anal fins. Nomorhamphus sagittarius, from the Mangolo river basin, has a longer (6.4–15.0 times in SL) lower jaw, and is further distinguished from all other members of the genus by presence of a few conspicuous teeth on the dorsal surface of the extended portion of the lower jaw. This brings the number of Nomorhamphus species endemic to Sulawesi to 12. Raffless Bulletin of Zoology, Vol. 62. 2014. P: 200-209