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| Oryzias kalimpaaensis Gani, Suhendra, Herder, Schwarzer, Möhring, Montenegro, Herjayanto & Mokodongan, 2022 |
Abstract
Oryzias kalimpaaensis sp. nov. is a new species of the genus Oryzias Jordan & Snyder, 1906, endemic to Lake Kalimpa’a in Lore Lindu National Park, Central Sulawesi, Indonesia. The species is a pelvic-brooder, a non-monophyletic group of ricefishes in which females carry an egg cluster until hatching. Pelvic-brooding is known from only a few taxa, and the new species reported here is only the fifth pelvic-brooding species known so far. Oryzias kalimpaaensis sp. nov. differs from all others Oryzias species by the following combination of characters: 61–67 scales in lateral line, 11–13 dorsal-fin rays, 11–13 pectoral-fin rays, body depth 16.0–22.2% SL, and length of head 30.1–33.7% SL. It is distinguished from all species of the genus Adrianichthys Weber 1913, by its small size (max. 52.8 mm SL). A molecular phylogeny based on mitochondrial ND2 sequences supports the distinctiveness of O. kalimpaaensis sp. nov. Oryzias kalimpaaensis sp. nov. is closely related to pelvic-brooding O. eversi Herder, Hadiaty & Nolte 2012 endemic to Tilanga Pond in Tana Toraja, and to the two species of Lake Lindu in Central Sulawesi, O. sarasinorum (Popta 1905) and O. bonneorum Parenti 2008. As Lake Kalimpa’a is a popular destination for nature tourism, anthropogenic pressure is high. The presence of invasive fish species in the lake and parasites on collected specimens support thiss assumption.
Key words. Endemic, Oryzias, freshwater fish, Kalimpa’a, pelvic-brooder.
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| Living specimens of Oryzias kalimpaaensis sp. nov., ♂ (top) and ♀ (bottom) from Lake Kalimpa’a, Central Sulawesi, Indonesia. |
Oryzias kalimpaaensis sp. nov.
Lake Kalimpa’a Ricefish
Diagnosis. Oryzias kalimpaaensis sp. nov. is a pelvic-brooding ricefish with pronounced sexual dimorphism. Females share with females of other pelvic-brooding ricefishes (O. eversi, O. sarasinorum, A. oophorus) morphological structures that enable the maternal fish to carry bundles of fertilized eggs. The eggs remain connected to the female by filaments, and are carried in a ventral concavity present in females but not in males.
Oryzias kalimpaaensis sp. nov. differs from all other Oryzias species from Sulawesi by unique lateral line scale counts (60–67 in O. kalimpaaensis sp. nov. vs. 70–75 in O. sarasinorum, vs. <58 in all remaining Sulawesi Oryzias). It has a deeper body than O. sarasinorum (16.0–22.2% SL vs. 13–15% SL). Oryzias kalimpaaensis sp. nov. has more dorsal-fin rays (11–13) than ...
Etymology. The species epithet, ‘kalimpaaensis’, denotes the occurrence of this species in Lake Kalimpa’a, Central Sulawesi, the type locality.
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| Lake Kalimpa’a: type locality of Oryzias kalimpaaensis sp. nov., in Central Sulawesi, Indonesia. |
Abdul Gani, Novian Suhendra, Fabian Herder, Julia Schwarzer, Jan Möhring, Javier Montenegro, Muh. Herjayanto and Daniel F. Mokodongan. 2022. A New Endemic Species of Pelvic-brooding Ricefish (Beloniformes: Adrianichthyidae: Oryzias) from Lake Kalimpa’a, Sulawesi, Indonesia. Bonn Zoological Bulletin. 71(1); 77-85. DOI: 10.20363/bzb-2022.71.1.077
https://zoologicalbulletin.de/articles/online-first
