C. gobioides can be distinguished from all of
its congeners by the combination of the presence of
an eye, the conical teeth on the vomer and dentary,
the rounded posterior nares that is distinctly separated
from the contralateral nares by a distance greater
than the width of the posterior nares, a mouth width
that is approximately one-half of HL, the absence
of a dark humeral spot, the absence of a posteriorly-rounded,
variably-developed, bilobed patch of dark pigmentation
at the base of the caudal fin, the absence of dark
chromatophores on the anterior and lateral margins
of the snout, the limitation of dark pigmentation
on the dorsal fin to, at most, the basal regions of
the middle portion of the fin in the form of spot
with a semicircular margin, and the possession of
17 to 22 branched anal-fin rays, 22 to 27 total anal-fin
rays, and 42 to 45 total vertebrae. Cetopsis gobioides
is very similar to C.
plumbea, a species
endemic to the western portions of the Amazon basin,
in its overall head and body form, overall colouration,
and meristic values. The two species are distinguishable
in the lack of the dark chromatophores on the anterior
and lateral surfaces of the snout in C. gobioides,
versus the presence of such dark pigmentation in that
region of C. plumbea.
Upper São Francisco, Paraná and Uruguay
River basins and Juquiá River of coastal Brazil.
Type locality: Irisanga, Brazil.
22-28°c (71-83°f )
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.
2016. FishBase. World Wide Web electronic publication.
www.fishbase.org, ( 01/2016 ). Vari, R.P., C.J. Ferraris,
Jr. and M.C.C. de Pinna
2005 The neotropical whale catfishes (Siluriformes:
Cetopsidae: Cetopsinae), a revisionary study. Neotrop.