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Mark Henry Sabaj (1) Nathan Lujan (1) naturalist1214 (1)

Description: The combination of the absence of a spinelet associated with the dorsal fin, the absence of spines on the dorsal and pectoral fins, and the possession of a single row of teeth on the vomer distinguishes Cetopsis from the other genera in the Cetopsinae. Habitat: It inhabits streams with moderate current and a depth of up to 1 m, occurring within such streams in areas over sand substrates but lacking vegetation. Sexual Dimorphism: The presumed males of Cetopsis plumbea have a distal filament on the first ray of the dorsal fin. That filament is absent in females and immature males of the species. Mature males also have the filament on the first pectoral-fin ray proportionally more elongate than the extension of the ray present in conspecific females and immature males. Mature males have an anal-fin margin that is distinctly convex contrary to the straight anal-fin margin that is characteristic of females and immature males of the species. Diet: Feeds on a variety of terrestrial and aquatic insects.

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Cetopsis plumbeus, Cetopsis macroteronema, Hemicetopsis plumbeus, Pseudocetopsis macropteronema, Pseudocetopsis macroteronema, Pseudocetopsis plumbea, Pseudocetopsis plumbeus.

Cetopsidae

South America: Upper Amazon River basin, Ecuador and Peru. Type locality: Canelos (Ecuador).

11.5cm. (4½ins)

22-28°c (71-83°f )

6.0-7.0.

Ferraris, C.J. Jr., 2007. Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types. Zootaxa 1418:1-628.
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.