Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
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: Atherinomorphae
Ordo: Cyprinodontiformes
Subordo: Cyprinodontoidei
Familia: Goodeidae
Subfamilia: Goodeinae
Genus: Xenotoca
Species: X. doadrioi – X. eiseni – X. lyonsi – X. melanosoma – X. variata
Name
Xenotoca Hubbs & Turner, 1939
Gender: feminine
Type species: Characodon variatus Bean, 1887, by original designation and monotypy.
References
Domínguez-Domínguez, O., Bernal-Zuñiga, D.M. & Piller, K.R. 2016. Two new species of the genus Xenotoca Hubbs and Turner, 1939 (Teleostei, Goodeidae) from central-western Mexico. Zootaxa 4189(1): 81–98. DOI: 10.11646/zootaxa.4189.1.3. Reference page.
Hubbs, C.L. & Turner, C.L. 1939. Studies of the fishes of the order Cyprinodontes. XVI. A revision of the Goodeidae. Miscellaneous publications. Museum of Zoology, University of Michigan 42: 1–80. PDF. Reference page.
Links
Xenotoca – Taxon details on Integrated Taxonomic Information System (ITIS).
Xenotoca is a genus of fish in the family Goodeidae from Mexico, where various species are found in a wide range of habitats, from rivers and creeks to pools and lakes, in the Lerma–Grande de Santiago, Panuco, Cuitzeo and other basins of the Mesa Central. While no goodeid is a very common aquarium fish, the redtail splitfin (X. eiseni), is one of the most common aquarium goodeids; its bright colors offset its reputation for being aggressive towards and occasionally even killing tankmates.[2] Similarly to X. eiseni, two species described in 2016 have males with red-orange tails, but this feature is not shared by the remaining members of the genus.[3] All Xenotoca species are relatively small, reaching up to 9 cm (4 in) in standard length.[4]
Species
X. doadrioi was only scientifically described in 2016 (it was formerly considerec a variant of X. eiseni). Like the other "redtails", only the male has a red-orange tail
There are currently five recognized species in this genus,[3][5] but two possibly undescribed species, tentatively referred to as Xenotoca cf. melanosoma and Xenotoca cf. variata, are known.[6][7]
Genetic work has shown that the genus, as currently defined, is not monophyletic: The type species X. variata is distantly related to the remaining, which could eventually be reallocated to their own genus.[3] Phylogenic research by Shane Webb showed that the closest relative of X. variata is the butterfly goodeid, Ameca splendens.[8]
Xenotoca doadrioi Domínguez-Domínguez, Bernal-Zuñiga & Piller, 2016 (San Marcos redtail splitfin)
Xenotoca eiseni (Rutter, 1896) (Redtail splitfin)
Xenotoca lyonsi Domínguez-Domínguez, Bernal-Zuñiga & Piller, 2016
Xenotoca melanosoma Fitzsimons, 1972 (Black splitfin)
Xenotoca variata (T. H. Bean, 1887) (Jeweled splitfin)
References
Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Xenotoca". Catalog of Fishes. California Academy of Sciences. Retrieved 22 September 2019.
"Xenotoca eiseni". SeriouslyFish. Retrieved 16 February 2016.
Domínguez-Domínguez, O.; Bernal-Zuñiga, D.M.; Piller, K.R. (2016). "Two new species of the genus Xenotoca Hubbs and Turner, 1939 (Teleostei, Goodeidae) from central-western Mexico". Zootaxa. 4189 (1): 81–98. doi:10.11646/zootaxa.4189.1.3. PMID 27988757.
"Xenotoca variata". Goodeid Working Group. Retrieved 24 September 2018.
Froese, Rainer; Pauly, Daniel (eds.). "Species in genus Xenotoca". FishBase. August 2012 version.
""Xenotoca" cf. melanosoma". Goodeid Working Group. Retrieved 24 September 2018.
""Xenotoca" cf. variata". Goodeid Working Group. Retrieved 24 September 2018.
Webb, Shane A.; Graves, Jefferson A.; Macias-Garcia, Constantino; Magurran, Anne E.; Foighill, Diarmaid O.; Ritchie, Michael G. (March 2004). "Molecular phylogeny of the livebearing Goodeidae (Cyprinodontiformes)". Molecular Phylogenetics and Evolution. 30 (3): 527–544. doi:10.1016/S1055-7903(03)00257-4. PMID 15012937. Retrieved 2023-06-01.
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