AMERICAN MUSEUM NOVITATES Number 3917, 16 pp. December 26, 2018 A new small barb (Cyprininae: Smiliogastrini) from the Louesse, Lekoumou (upper Niari basin), and Djoulou (upper Ogowe basin) rivers in the Republic of Congo, west-central Africa
Authors
VICTOR MAMONEKENE,1 ARMEL IBALA ZAMBA,1 AND MELANIE L.J. STIASSNY2
FIGURE 2. Enteromius walshae, new species: A, AMNH 266856, holotype (female) in preservation; B, individual from the same population in life. C, AMNH 266858, paratype (male) in preservation; D, individual from same population in life; E, digestive tract, afer removal of liver and adherent tissues (approximately to scale).
ABSTRACT
A new species of smiliogastrin cyprinid is described from the Louesse, Lekoumou (upper Niari basin), and Djoulou (upper Ogowe basin) rivers in the Republic of Congo, west-central Africa. The new species is readily distinguished from congeners by the pres- ence of a flexible, weakly ossified and smooth bordered last unbranched dorsal-fin ray, well-developed barbels, and a straight and complete lateral line in combination with a characteristic pigmentation patterning consisting of a distinctive, rounded black spot at the base of and extending over the first rays of the anal fin and a prominent, darkly pigmented blotch over the base of the anterior dorsal-fin rays. A combination of morphological fea- tures and pigmentation patterning that appears to be unique among Enteromius. The new species is widespread throughout the Louesse-Djoulou region, and the fact that such a seemingly common species has gone undetected until now serves to underscore how poorly known this region of the Republic of Congo remains.
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