Ptychochromis onilahy was a species of cichlid endemic to the Onilahy River in southwestern Madagascar. Despite several recent visits to the region, this species has not been recorded since 1962 when the only known five specimens were collected.[1] It is listed as extinct by the IUCN (their initial rating was made before its official description, and therefore listed under the temporary name Ptychochromis sp. nov. 'Kotro'),[1] but the Onilahy River system is large, and there is a small chance remnant populations exist in remote regions.[2] This species can reach a length of 8.6 centimetres (3.4 in) SL.[3]
^ abcSparks, J.S. (2016). "Ptychochromis onilahy". IUCN Red List of Threatened Species. 2016: e.T44504A58308545. doi:10.2305/IUCN.UK.2016-3.RLTS.T44504A58308545.en. Retrieved 14 November 2021.
^Stiassny, M., and Sparks, J. S. (2006). Phylogeny and Taxonomic Revision of the Endemic Malagasy Genus Ptychochromis (Teleostei: Cichlidae), with the Description of Five New Species and a Diagnosis for Katria, New Genus. American Museum Novitates 3535.
^Froese, Rainer; Pauly, Daniel (eds.) (2013). "Ptychochromis onilahy" in FishBase. April 2013 version.
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Saint-Augustin. Two species of cichlids are endemic to the river basin, but Ptychochromisonilahy is probably already extinct and the remaining range of Ptychochromoides...
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