SCOTCAT.COM  

Mario Pinheiro (1) A. M. Katz (1) Donin LM, Ferrer J, Carvalho TP. 2022 (1)

A new species assigned to the genus Trichomycterus (2017) but now moved into the new genus of Cambeva. Abstract: 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. The new genus Cambeva (2020) 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. Description: C. davisi. The first anal-fin pterygiophore placed anteriorly to the 22nd-23rd hemal spines of the vertebral column (vs. anteriorly to the 20-25th), and the antorbital segment of the laterosensory system (pores i1 and i3) absent (vs. present) (Donin LM, Ferrer J, Carvalho TP. 2022). Habitat: The species of Cambeva occur in the Paraná, São Francisco, Ribeira de Iguape, and Uruguay river basins, as well as in smaller isolated coastal river basins of south-eastern and southern Brazil. C. davisi is restricted to the headwaters of the Ribeira de Iguape River basin. Colouration: Distinguished from its congeners by its mottled colour pattern composed of coalescent and irregular black marks (vs. mottled pattern forming saddles dorsally; body with large rounded or ellipsoid black blotches; with spots or rounded blotches forming a mid-lateral line, with small circular blotches not coalescent) (Donin LM, Ferrer J, Carvalho TP. 2022). Diet: will feed on most aquarium fare such as tablet, frozen and live foods. Etymology: The specific name davisi: In honour of “Dr. Davis,” possibly Walter Gould Davis (1851–1919), Argentine Meteorological Service, “who in various ways” assisted Haseman during the latter part of his collecting trip to South America. Remarks: Still found on some online sources as Trichomycterus davisi.

None

Pygidium davisi, Trichomycterus davisi

Trichomycteridae

South America: Upper Paraná River and Iguaçu and Ribeira de Iguapé River basins: Argentina and Brazil. Type locality: Serrinha Paraná, Rio Iguaçu system, Brazil.

6.5cm. (2½ins)

16-26°c (59-79°f.)

6.0-7.0.

Brejão, G.L. 2023. Cambeva davisi. The IUCN Red List of Threatened Species 2023.
Burgess, W.E., 1989. An atlas of freshwater and marine catfishes. A preliminary survey of the Siluriformes. T.F.H. Publications, Inc., Neptune City, New Jersey (USA).
Donin LM, Ferrer J, Carvalho TP. Uncertainties and risks in delimiting species of Cambeva (Siluriformes: Trichomycteridae) with single-locus methods and geographically restricted data. Neotrop Ichthyol. 2022.
Froese, R. and D. Pauly. Editors. 2017. FishBase. World Wide Web electronic publication. www.fishbase.org, ( 04/2018 ).
Katz, A. M., M. A. Barbosa, J. L. O. Mattos and W. J. E. M. Costa 2018 (22 Nov.) Multigene analysis of the catfish genus Trichomycterus and description of a new South American trichomycterine genus (Siluriformes, Trichomycteridae). Zoosystematics and Evolution v. 94 (no. 2): 557-566.
The ETYFish Project Fish Name Etymology Database © Christopher Scharpf.