Florida Museum of Natural History

Cetopsidium pemon

Cetopsidium pemon

Cetopsidium pemon

Photos by Britt Griswold
Reproduced from Vari, Ferraris and de Pinna (2005).


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Cetopsidium pemon Vari, Ferraris & de Pinna, 2005

Identification: Cetopsidium pemon differs from C. ferreirai in the degree of development of the first rays of the dorsal and pectoral fins (with distal filaments present in presumed males as indicated by the possession of a distinctly convex anal-fin margin versus absent in such specimens, respectively), the overall form of the head (profile of head distinctly pointed versus anteriorly rounded in lateral view, respectively), and in the length of the snout (approximately 3 times diameter of eye versus approximately 2 times diameter of eye, respectively). Cetopsidium pemon differs from C. minutum in the length of the pelvic fin (barely reaching or falling short of the vent versus reaching to the anal-fin origin, respectively). Cetopsidium pemon differs from C. morenoi in the form of the dark pigmentation on the body (small, point-like, scattered chromatophores located on the dorsal and lateral surfaces of the head versus large stellate chromatophores present in those areas, respectively) and in the degree of development of the adductor mandibular muscles (moderately-developed and not particularly obvious externally versus very well developed and distinctly obvious externally on dorsolateral portion of head, respectively). Cetopsidium pemon differs from C. orientale in the overall coloration (small, point-like, scattered chromatophores over the dorsal and lateral surfaces of the head and body versus large, stellate, dark chromatophores which densely cover the dorsal and lateral surfaces of the head and body, respectively), and in the alignment of the dorsal and ventral profiles of the portion of the body posterior of the base of dorsal fin (converging posteriorly versus running in parallel, respectively). Cetopsidium pemon differs from C. roae in the position of the vent (located proximate to versus distinctly separated from the base of the anterior most anal-fin ray, respectively), in the alignment of the dorsal and ventral profiles of the portion of the body posterior of the base of dorsal fin (converging posteriorly versus running in parallel, respectively), and in the degree of development of the first rays of the dorsal and pectoral fins (with distal filaments present in presumed males as indicated by the possession of a distinctly convex anal-fin margin versus the apparent absent of these structures, respectively).

Range: Cetopsidium pemon is known from the Río Caroni and the Río Caura basins, southern tributaries of the Río Orinoco in eastern Venezuela, the Río Meta basin of the western portions of the Río Orinoco system in eastern Colombia, and the upper portions of the Rio Branco in northern Brazil.

Information from Vari, R. P., C. J. Ferraris Jr. & M. C. C. de Pinna. 2005. The Neotropical whale catfishes (Siluriformes: Cetopsidae: Cetopsinae), a revisionary study. Neotropical Ichthyology 3:127-238.


distribution map

Distribution Map




This site is part of the All Catfish Species Inventory Project

Authored by Carl J. Ferraris, Jr. and Richard P. Vari
Webpage and map compiled by Griffin E. Sheehy
Contact: Carl J. Ferraris, Jr
Updated: July 12, 2007
Carl J. Ferraris, Jr
2944 NE Couch St.
Portland, OR 97232
Richard P. Vari
Smithsonian Institution
Washington, D.C. 20560