(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. Remarks:
Still found on some online sources as Trichomycterusdavisi.
Pygidium davisi, Trichomycterusdavisi
South America:Upper Paraná River and Iguaçu
and Ribeira de Iguapé River basins: Argentina
and Brazil. Type locality: Serrinha
Paraná, Rio Iguaçu system, 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). 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.