Peces Criollos - Freshwater Fishes of Argentina Peces Criollos - Freshwater Fishes of Argentina
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Cambeva stawiarski comb.nov. from Trichomycterus

Trichomycterus stawiarski - Casciotta et al (2016)
Cambeva sta­wiarski (photo from Casciotta et al. 2016)

new combination:
Cambeva sta­wiarski (Miranda Ribeiro, 1968)

published in:
Katz, A.M., M.A. Barbosa, J.L. Oliveira Mattos & W.J.E.M. Costa (2018):
Multigene analysis of the catfish genus Trichomycterus and description of a new South American trichomycterine genus (Siluriformes, Trichomycteridae).
Zoosystematics and Evolution 94 (2): 557-566.

abstract (from publication):
Trichomycterus comprises about 170 valid species, but its monophyly has been chal­lenged in the last decades. Bayesian Inference and Maximum Likelihood analyses com­prehending mitochondrial genes COI and CYTB and nuclear genes GLYT, MYH6 and RAG2 from 71 Trichomycterinae terminal taxa and eight outgroups were performed. The analyses highly supports a clade containing Trichomycterus nigricans, the type species of the genus, and several other congeners endemic to eastern and northeastern Brazil, herein considered as the genus Trichomycterus, the sister clade the southern Brazil and adjacent areas clade; the latter clade comprises two subclades, one comprising species of the genus Scleronema and another comprising species previously placed in Trichomycterus, herein described as a new genus. Cambeva gen. n. is distinguished from all other trichomyc­terines by the presence of a bony flap on the channel of the maxillo-dentary ligament, the interopercle shorter than the opercle, a deep constriction on the basal portion of the antero-dorsal arm of the quadrate, absence of teeth in the coronoid process of the dentary, the maxilla shorter than the premaxilla, the cranial fontanel extending from the the medial posterior of frontal to the medial region of supraoccipital, and absence of the postorbital process of the sphenotic-prootic-pterosphenoid.

remarks (from publication):
Included species. Cambeva davisi (Haseman, 1911)… 
Oth­er species, not included in the molecular analysis but ex­hibiting generic morphological diagnostic character states and congruent geographical distribution are: Cambeva sta­wiarski (Miranda Ribeiro, 1968),… 
The fol­lowing species, were not examined or lack the necessary osteological information on their original descriptions, but have the general external appearance and occur in the same basins that Cambeva is distributed, so they are tentatively included in the new genus: … Cambeva mboycy (Wosiacki & Garavello, 2004),… and Cambeva ytororo (Terán, Ferrer, Benitez, Alonso, Aguilera & Mirande, 2017).

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