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Onilahy River

Coordinates: 23°34′00″S 43°45′00″E / 23.5666667°S 43.75°E / -23.5666667; 43.75
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Onilahy River
Onilahy River estuary
Map of Malagasy rivers (Onilahy flows from the south-central part to the southwestern coast).
Location
CountryMadagascar
CitiesMandrofify, Ambolofoty
Physical characteristics
Source 
 • locationnear Betroka
MouthBay of Saint-Augustin
 • location
Saint Augustin, Mozambique Channel
Length525 km (326 mi)
Basin features
Protection status
Official nameZones humides de l'Onilahy
Designated22 May 2017
Reference no.2304[1]

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°E / -23.5666667; 43.75), and into the Bay of Saint-Augustin.

Two species of cichlids are endemic to the river basin, but Ptychochromis onilahy is probably already extinct[2] and the remaining range of Ptychochromoides betsileanus covers less than 10 square kilometres (3.9 sq mi).[3][4]

References

  1. ^ "Zones humides de l'Onilahy". Ramsar Sites Information Service. Retrieved 25 April 2018.
  2. ^ 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.
  3. ^ Loiselle, P. & participants of the CBSG/ANGAP CAMP "Faune de Madagascar" workshop 2004 (2004). "Ptychochromoides betsileanus". IUCN Red List of Threatened Species. 2004. Retrieved 14 July 2011. {{cite journal}}: Invalid |ref=harv (help)CS1 maint: numeric names: authors list (link)
  4. ^ Walaszczyk, I.; Marcinowski, R.; Praszkier, T.; Dembicz, K.; Bieńkowska, M. (August 2004). "Biogeographical and stratigraphical significance of the latest Turonian and Early Coniacian inoceramid/ammonite succession of the Manasoa section on the Onilahy River, south-west Madagascar". Cretaceous Research. 25 (4): 543–576. doi:10.1016/j.cretres.2004.05.001. ISSN 0195-6671.