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. 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.
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.
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. 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). 784 p. Froese, R. and D. Pauly. Editors.
2020. FishBase. World Wide Web electronic publication.
www.fishbase.org, ( 12/2020 ). Ferraris, C.J. Jr., 2007. Checklist
of catfishes, recent and fossil (Osteichthyes: Siluriformes),
and catalogue of siluriform primary types. Zootaxa