Ptychochromis onilahy

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Ptychochromis onilahy
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Cichliformes
Family: Cichlidae
Genus: Ptychochromis
Species:
P. onilahy
Binomial name
Ptychochromis onilahy
Stiassny & Sparks, 2006

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]

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Onilahy is a river in Atsimo-Andrefana and Anosy, southern Madagascar. It flows down from the hills near Betroka to the Mozambique Channel. It empties at St. Augustin, and into the Bay of Saint-Augustin.

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<i>Ptychochromis grandidieri</i> Species of fish

Ptychochromis grandidieri is a species of fish in the family Cichlidae endemic to river basins along a large part of the eastern coast of Madagascar, although it has been recorded as far as 100 km (62 mi) inland. Uniquely in the genus Ptychochromis, this species also occurs in brackish water. It reaches 35cm in standard length. It shares a large part of its range with a cichlid from another genus, Paretroplus polyactis. The specific name honours Alfred Grandidier (1836-1921), the French naturalist and explorer who, with Henri Joseph Léon Humblot (1852-1914), collected the type.

<i>Ptychochromis</i> Genus of fishes

Ptychochromis is a genus of cichlids endemic to rivers and lakes in Madagascar. One species can also be seen in brackish water. Most species in this genus are threatened, and P. onilahy is probably extinct. Most reach a length of 15 to 20 cm, but P. insolitus reaches 25 cm (10 in), while P. grandidieri and P. oligacanthus reach 35 cm (14 in) and 20 cm (8 in) respectively. The largest species was P. onilahy which may have reached as much as 45 cm (18 in) if reports of fishermen are to be believed.

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The trondo mainty is a critically endangered species of cichlid endemic to the Onilahy River Basin in southwestern Madagascar. Its remaining range covers less than 10 km2 (3.9 sq mi) and it is highly threatened by habitat loss, fishing, and competition with/predation by introduced species. Another cichlid from the same basin, Ptychochromis onilahy, is probably already extinct. The trondo mainty reaches a standard length (SL) of 24 cm (9.4 in).

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<i>Ptychochromis insolitus</i> Species of fish

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Ptychochromis ernestmagnusi is a species of fish cichlid only known from the Mananara du Nord River in northeastern Madagascar, but it is probably more widespread in that region. If so, it likely occurs in the Mananara-Nord Biosphere Reserve, which would give it a level of protection. It can reach 14.7 cm (5.8 in) in standard length.

Paretroplus loisellei is a vulnerable species of cichlid fish from the Mahanara River basin north of Sambava in northeastern Madagascar. Until its scientific description in 2011, this population was usually referred to as Paretroplus sp. nov. "Ventitry" or included in P. damii, which it resembles. It reaches about 15 centimetres (5.9 in) in length, and is threatened by habitat loss and introduced species. The similar named Ptychochromis loisellei is also restricted to the Mahanara River basin. The specific name honours Paul V. Loiselle, Emeritus Curator of Freshwater Fishes at the New York Aquarium and a researcher in, and campaigner for the conservation of, the freshwater fish of Madagascar.

Ptychochromis mainty is a species of cichlid from the subfamily Ptychochrominae, a subfamily which is endemic to the freshwaters of Madagascar. It has only been recorded from forested streams in the vicinity of Fort Dauphin in the south eastern part of the island. Its closest relative is Ptychochromis grandidieri.

References

  1. 1 2 3 Sparks, 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.
  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. Froese, Rainer; Pauly, Daniel (eds.) (2013). "Ptychochromis onilahy" in FishBase . April 2013 version.