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Two new Phenacogrammus (Characoidei; Alestidae) from the Ndzaa River (Mfimi-Lukenie basin) of central Africa, Democratic Republic of Congo (American Museum novitates, no. 3980)

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dc.contributor.author Stiassny, Melanie L. J.
dc.contributor.author Alter, S. Elizabeth
dc.contributor.author Monsembula Iyaba, Raoul J. C.
dc.contributor.author Liyandja, Tobit L. D.
dc.date.accessioned 2021-11-03T19:24:44Z
dc.date.available 2021-11-03T19:24:44Z
dc.date.issued 2021-11-03
dc.identifier.issn 0003-0082
dc.identifier.uri http://hdl.handle.net/2246/7284
dc.description 22 pages : color illustrations, color map ; 26 cm. en_US
dc.description.abstract Two new Phenacogrammus are described from the Ndzaa River, a small left-bank tributary of the Mfimi-Lukenie River in the central Congo basin. They share with P. deheyni, a congener endemic to the Cuvette Centrale to the north, a prominent anterior expansion of the first pleural rib; a feature interpreted here as a synapomorphy diagnostic for this species assemblage. The two new species are readily differentiated from P. deheyni based on differences in pigmentation patterning, a lower number of scales in longitudinal series (26–28 vs. 29–33) and a longer head length (m. 24.9% SL vs. 21.7 and 23.2% SL). Phenacogrammus flexus, new species, is distinguished from all congeners in the possession of 6 (vs. 7) supraneural bones, and a characteristic zigzag pattern of black pigmentation along and below the midline extending from the posterior border of the opercle to the base of the caudal peduncle. While no unambiguous morphological autapomorphies have been located to diagnose P. concolor, new species, it is nonetheless readily distinguished from all congeners, except P. deheyni and P. flexus, in the possession of a prominent anterior expansion of the first pleural rib. It differs from both P. deheyni and P. flexus in the absence of a dominant pigmentation patterning over the flanks and caudal peduncle. Additionally, it differs from P. flexus in a shallower body depth (m. 24.9% vs. 27.0% SL) and in the possession of 7 (vs. 6) supraneurals. The three species exhibit extensive divergence in mt-COI sequence (P. flexus vs. P. concolor 10.2%–11%; P. flexus vs deheyni 12.9%–13.5%; P. concolor vs. deheyni 11.3%–12.9%). Furthermore, analysis of shape variation utilizing geometric morphometrics indicates that each species differs significantly in body shape. en_US
dc.language.iso en_US en_US
dc.publisher American Museum of Natural History. en_US
dc.relation.ispartofseries American Museum novitates;no.3980
dc.subject Phenacogrammus flexus. en_US
dc.subject Phenacogrammus concolor. en_US
dc.subject Cypriniformes -- Congo River Valley -- Classification. en_US
dc.subject Cypriniformes -- Congo (Democratic Republic) en_US
dc.subject Fishes -- Congo River Valley -- Classification. en_US
dc.subject Fishes -- Congo (Democratic Republic) en_US
dc.title Two new Phenacogrammus (Characoidei; Alestidae) from the Ndzaa River (Mfimi-Lukenie basin) of central Africa, Democratic Republic of Congo (American Museum novitates, no. 3980) en_US


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  • American Museum Novitates
    Novitates (Latin for "new acquaintances"), published continuously and numbered consecutively since 1921, are short papers that contain descriptions of new forms and reports in zoology, paleontology, and geology. New numbers are published at irregular intervals.

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