Onilahy River

Onilahy River
River
Onilahy River estuary
Country	Madagascar
Cities	Mandrofify, Ambolofoty
Source
- location	near Betroka
Mouth	Bay of Saint-Augustin
- location	Saint Augustin, Mozambique Channel
Length	525 km (326 mi)
Map of Malagasy rivers (Onilahy flows from the south-central part to the southwestern coast).

Onilahy is a river in Toliara Province, southern Madagascar. It flows down from the hills near Betroka to the Mozambique Channel. It empties at St. Augustin (23°34′00″S 43°45′00″E / 23.5666667°S 43.75°ECoordinates: 23°34′00″S 43°45′00″E / 23.5666667°S 43.75°E), and into the Bay of Saint-Augustin.

Two species of cichlids are endemic to the river basin, but Ptychochromis onilahy is probably already extinct^[1] and the remaining range of Ptychochromoides betsileanus covers less than 10 square kilometres (3.9 sq mi).^[2]

References

1. 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.
2. Loiselle, P. & participants of the CBSG/ANGAP CAMP "Faune de Madagascar" workshop 2004 (2004). "Ptychochromoides betsileanus". IUCN Red List of Threatened Species. Version 2011.1. International Union for Conservation of Nature. Retrieved 14 July 2011.