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A new Alestopetersius is described from the Kwilu River in the Kasai basin of the Democratic Republic of Congo. Alesto- petersius conspectus, new species, is readily distinguished from all congeners based on attributes of squamation and col-oration. It is distinguished from “Duboisialestes” tumbensis by tooth morphology and in the possession of a distinctivecaudal-fin pigmentation patterning consisting of a median black band extending to the caudal-fin margin and flanked bydense black bands in both upper and lower fin lobes. “Duboisialestes” bifasciatus, which shares similar caudal-fin pig-mentation patterning, is distinguished from A. conspectus by the absence of a broad mid-lateral band on the body, and bytooth morphology. Results from an analysis of the relationships and generic composition of the Alestidae provide supportfor the monophyly for Alestopetersius inclusive of the members of the genus Duboisialestes, which are placed into syn-onomy with the former.Une nouvelle espece de Alestopetersius est decrite de la riviere Kwilu dans le bassin du Kasai de la RepubliqueDemocratique du Congo. Alestopetersius conspectus, nouvelle espece, se distingue tres facilement de tout ses congeneressur les attributs de la squamation et coloration. Cette espece est distinguee de “Duboisialestes” tumbensis par la morphol-ogie des dents et par la possession d'un type de pigmentation de la nageoire caudale composee d’une bande noire medianes'etendant de la marge de la caudale et flanquee de denses bandes noires dans les deux lobes superieur et inferieur de lanageoire. “Duboisialestes” bifasciatus qui partage le meme type de pigmentation de la nageoire caudale, se distingue de A. conspectus par l'absence d'une large bande mi-laterale sur le corps, et par la morphologie des dents. Les resultats d'uneanalyse des relations et de la composition generique du Alestidae fournissent un soutien pour la monophylie des Alestopetersius incluant les membres du genre Duboisialestes, qui sont places en synonymie avec le genre precedent.

zootaxa

A new Alestopetersius (Characiformes: Alestidae) from the Kwilu River (Kasai basin) of central Africa; with a phylogeny for the genus and synonymy of Duboisialestes