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Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Cladus: Craniata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Superclassis/Classis: Actinopterygii
Classis/Subclassis: Actinopteri
Subclassis/Infraclassis: Neopterygii
Infraclassis: Teleostei
Megacohors: Osteoglossocephalai
Supercohors: Clupeocephala
Cohors: Euteleosteomorpha
Subcohors: Neoteleostei
Infracohors: Eurypterygia
Sectio: Ctenosquamata
Subsectio: Acanthomorphata
Divisio/Superordo: Acanthopterygii
Subdivisio: Percomorphaceae
Series: Ovalentaria
Superordo: Cichlomorphae
Ordo: Cichliformes

Familia: Cichlidae
Subfamilia: Pseudocrenilabrinae
Tribus: Oreochromini
Genus: Alcolapia
Species: A. alcalica – A. grahami – A. latilabris – A. ndalalani
Name

Alcolapia Thys van den Audenaerde, 1969: xxxv

Type species: Tilapia grahami Boulenger, 1912
Type by original designation

References

Thys van den Audenaerde, D.F.E. 1969: An annotated bibliography of Tilapia (Pisces, Cichlidae). Documentation Zoologique / Musée royal de l'Afrique centrale No. 14: i-xl + 1-406. (Date of this reference is 1969 not 1968 per the authoritative Catalog of Fishes)

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Nomenclator Zoologicus

Alcolapia is a genus of small fishes in the family Cichlidae. Their native range is restricted to margins of Lake Natron and Lake Magadi, as well as similar conditions in nearby hot springs, in Kenya and Tanzania.[1] They live in waters that are warm (mostly 30–42.8 °C [86–109 °F], although occasionally down to 20 °C [68 °F]), hypersaline (salinity above 40‰) and alkaline (pH above 10).[1][2] Species from this genus have also been introduced to Lake Nakuru and Lake Elmenteita.[3] They are the only fish in their range.[1]

The different Alcolapia species differ primarily in the position of their mouth (straight, upturned or downturned) and the colors of the adult males.[1] They are fairly small fish, with the largest species reaching up to 20 cm (7.9 in) in standard length.[3] They mostly feed on algae and cyanobacteria, but also take other plant material, fish eggs, fry and remains, and insects in smaller quantities (except A. alcalica, which feed on other plant material at about the same level as algae and cyanobacteria).[1] They are maternal mouthbrooders.[4]

Taxonomy
A. grahami in its native habitat in Lake Magadi; the other species are native to Lake Natron

Alcolapia was first included in Tilapia, then moved to Oreochromis and finally to their own genus. Nevertheless, the genus is very closely related to Oreochromis, and O. amphimelas and O. esculentus appear to be closer to Alcolapia than they are to other Oreochromis species. Similar to Alcolapia, O. amphimelas inhabits Tanzanian lakes that can be highly alcaline and saline.[2] A potential solution is to merge Alcolapia into Oreochromis,[2] as done by Catalog of Fishes.[5]
Species

There are currently four recognized species in this genus:[3]

Alcolapia alcalica (Hilgendorf, 1905) (Magadi tilapia)
Alcolapia grahami (Boulenger, 1912)
Alcolapia latilabris (Seegers & Tichy, 1999)
Alcolapia ndalalani (Seegers & Tichy, 1999)

See also

Danakilia – another cichlid genus from warm, saline lakes in Africa.

References
Wikispecies has information related to Alcolapia.

Ford, A.G.P.; L. Ruber; J. Newton; K.K. Dasmahapatra; J.D. Balarin; K. Bruun; J.J. Day (2016). "Niche divergence facilitated by fine-scale ecological partitioning in a recent cichlid fish adaptive radiation". Evolution. 70 (12): 2718–2735. doi:10.1111/evo.13072. PMC 5132037. PMID 27659769.
Ford, A.G.P.; et al. (2019). "Molecular phylogeny of Oreochromis (Cichlidae: Oreochromini) reveals mito-nuclear discordance and multiple colonisation of adverse aquatic environments" (PDF). Mol. Phylogenet. Evol. 136: 215–226. doi:10.1016/j.ympev.2019.04.008. PMID 30974200.
Froese, Rainer and Pauly, Daniel, eds. (2019). Species of Alcolapia in FishBase. September 2019 version.
Genner, M.J.; G.F. Turner; B.P. Ngatunga (2018). "A Guide to Tilapia Fishes of Tanzania" (PDF). Retrieved 6 November 2019.
Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Species in the genus Oreochromis". Catalog of Fishes. California Academy of Sciences. Retrieved 11 December 2019.

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