Description of a rheophilic Tilapia species Smith, 1840 (Teleostei: Cichlidae) from Guinea with comments on Tilapia rheophila Daget, 1962

摘要

Tilapia konkourensis, new species, is described on the basis of three specimens from the upper Konkoure River and its tributary Kakrima. The rheophilic species differs from all other Tilapia sensu lato except T. fusiforme Dunz & Schliewen, 2010 in a shallower body 30.0-31.5% vs. 32.9-52.5% SL and from T. fusiforme in having eight instead of nine to twelve lower lateral-line scales. It is most similar to Tilapia rheophila Daget, 1962, type species of the monotypic subgenus Tilapia (Dagetia) Thys van den Audenaerde, 1969. An evaluation of the putative autapomorphies diagnosing Dagetia revealed that all are shared with members of the subgenus Coptodon Gervais, 1853 sensu Thys van den Audenaerde, 1969; hence, Tilapia (Dagetia) is placed in the synonymyof Tilapia (Coptodon).