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Tribe Ectodini

Synopsis of Xenotilapia Boulenger, 1899

A cura di , 2005. print format
Ultimo aggiornamento in data 24-Nov-2005
Thomas Andersen, 2005

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Type species: Xenotilapia sima Boulenger, 1899

Pair in aquarium

Xenotilapia sima pair in the aquarium. Photo by Thomas Andersen. Determiner >Thomas Andersen.

Distinctive characters:

In 1986 Max Poll outlined the following distinctive characters for the genus Xenotilapia, and at the same time separated the genera Enantiopus, Microdontochromis and Asprotilapia from Xenotilapia.

Xenotilapia sensu Poll 1986:

In his revision of Xenotilapia Tetsumi Takahashi showed via morphological analyses, that the criteria which the separation of the three genera Enantiopus, Asprotilapia and Microdontochromis was based upon overlapped with Xenotilapia, and that the latter would not be a monophyletic group if these three genera were not included again. The expanded concept of Xenotilapia sensu Takahashi is thus "characterized by having a unique infraorbital condition: four infraorbitals, in which the anteriormost bone bears four or five sensory pores and does not overlap the elongated second bone. The only exception found among the expanded Xenotilapia was the occurrence of six sensory pores on in one specimen of X. leptura" (Takahashi 2003).

Species currently included sensu Takahashi 2003:

Xenotilapia bathyphila Poll, 1956

Type locality:

Sumbu Bay, Zambia

Taxonomic history:

Synonyms:

None

Xenotilapia boulengeri (Poll, 1942)

Type locality:

Rumonge, Burundi.

Taxonomic history:

Synonyms:

Xenotilapia burtoni Poll, 1951

Type locality:

Burton Bay, DR Congo (former Zaire).

Taxonomic history:

Synonyms:

None

Xenotilapia caudafasciata Poll, 1951

Type locality:

Moba Bay, DR Congo (former Zaire).

Taxonomic history:

None

Synonyms:

None

Xenotilapia flavipinnis Poll, 1985

Type locality:

Ruziba, Burundi.

Taxonomic history:

None

Synonyms:

None

Xenotilapia leptura (Boulenger, 1901)

Type locality:

Msambu, Tanzania.

Taxonomic history:

Synonyms:

None

Xenotilapia longispinis Poll, 1951

Type locality:

Between the Ruzizi River and Bujumbura, Burundi

Taxonomic history:

None

Synonyms:

None

Xenotilapia melanogenys (Boulenger, 1898)

Type locality:

Moliro, DR Congo (former Zaire).

Taxonomic history:

Synonyms:

Xenotilapia nasus De Vos & van den Audenaerde, 1995

Type locality:

Gitaza, Burundi

Taxonomic history:

None

Synonyms:

None

Xenotilapia nigrolabiata Poll, 1951

Type locality:

Msamba Bay, Tanzania

Taxonomic history:

None

Synonyms:

None

Xenotilapia ochrogenys (Boulenger, 1914)

Type locality:

Kilewa Bay, DR Congo (former Zaire)

Taxonomic history:

Synonyms:

Xenotilapia ornatipinnis Boulenger, 1901

Type locality:

Kibwesi, Tanzania

Taxonomic history:

None

Synonyms:

None

Xenotilapia papilio Büscher, 1990

Type locality:

40 km south of Moba (Tembwe Deux), DR Congo (former Zaire).

Taxonomic history:

None

Synonyms:

None

Xenotilapia rotundventralis (Takahashi, Yanagisawa & Nakaya, 1997)

Type locality:

Nkumbula Island, Zambia.

Taxonomic history:

Synonyms:

None

Xenotilapia sima Boulenger, 1899

Type locality:

Moliro, DR Congo (former Zaire).

Taxonomic history:

None

Synonyms:

None

Xenotilapia tenuidentata Poll, 1951

Type locality:

Vua Bay, DR Congo (former Zaire).

Taxonomic history:

Synonyms:

None

Remarks on taxonomic status:

As mentioned earlier Xenotilapia sensu Takahashi now encompasses the species in the former genera Enantiopus, Microdontochromis and Asprotilapia, a total of 17 species. Takahashi´s revision and the applicability of the expanded concept of Xenotilapia will be discussed in separate paper.

Takahashi´s expanded Xenotilapia equals Sturmbauer & Meyer´s Asprotilapia-clade, one of four major clades identified within the tribe Ectodini by molecular analyses (Sturmbauer & Meyer 1993). This has recently been confirmed by another molecular work, which has also shown that the clade underwent a major radiation immediately after its origin. Quite interestingly the analyses suggest that Xenotilapia sensu Takahashi is polyphyletic and therefore in need of a revision (Koblmüller et al. 2004). This topic will be addressed in a separate paper.

Referenze:

Citazione:

Andersen, Thomas. (Novembre 24, 2005). "Synopsis of Xenotilapia Boulenger, 1899". The Cichlid Room Companion. URL consultato in data Luglio 25, 2014, da: http://www.cichlidae.com/section.php?id=108&lang=it.