Cetopsis pearsoni Vari, Ferraris & de Pinna, 2005
Identification: Cetopsis pearsoni can be distinguished from all of its congeners by the combination of the presence of an eye, the conical teeth on the vomer and the dentary, the rounded posterior nares which is distinctly separated from the contralateral nares by a distance greater than the width of the posterior nares, the absence of a dark humeral spot, the presence of a posteriorly-rounded, variably-developed, bilobed patch of dark pigmentation at the base of the caudal fin, the absence of a spot of dark pigmentation on the base of the dorsal fin, the absence of prominent dark pigmentation along the membrane behind the first ray of the dorsal fin, and the combination of the presence of fine spotting on the dorsolateral and lateral surfaces of the body, and the lack of approximately eye-size, dark spots on the lateral surface of the body. Maximum size: 114 mm SL.
Range: Cetopsis pearsoni occurs in the upper portions of the Rio Madeira drainage basin in southeastern Peru and northeastern Bolivia.
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.