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:
Dorsal spines (total): 2; Dorsal soft rays (total):
9-10; Anal spines: 1-2; Anal soft rays: 5. Colouration:
Colouration composed of numerous black spots or sparse
rounded black blotches, sometimes concentrated along
de mid-lateral line of the body, over a pale-yellow
or a grayish background (vs. body with mottled pattern
of blotches) (Donin
LM, Ferrer J, Carvalho TP. 2022).
Habitat: 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. Remarks:
Still found on some online sources as Trichomycterus
iheringi and Pygidium iheringi (synonyms).
Pygidium iheringi, Trichomycterus
South America:Ribeira do Iguape River basin in Brazil.
Type Locality: São Paulo in
coastal streams and Parana basin, Brazil.
1989. An atlas of freshwater and marine catfishes.
A preliminary survey of the Siluriformes. T.F.H. Publications,
Inc., Neptune City, New Jersey (USA). 784 p. 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. Ferraris, C.J. Jr., 2007. Checklist
of catfishes, recent and fossil (Osteichthyes: Siluriformes),
and catalogue of siluriform primary types. Zootaxa
1418:1-628. Froese, R. and D. Pauly. Editors.
2020. FishBase. World Wide Web electronic publication.
www.fishbase.org, ( 12/2020 ). 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.