Heptapterus collettii Steindachner, 1881: a Member of the Asian bagrid genus Olyra erroneously assigned to the Neotropical fauna (Siluriformes: Ostariophysi)

Pinna, Mário C. C. de; Bockmann, Flávio A.

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Heptapterus collettii Steindachner, 1881: a Member of the Asian bagrid genus Olyra erroneously assigned to the Neotropical fauna (Siluriformes: Ostariophysi)

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Author(s):	Pinna, Mário C. C. de ; Bockmann, Flávio A. ^[2] Total Authors: 2
Document type:	Journal article
Source:	Copeia; v. 4, n. 3, p. 665-675, 2004.
Field of knowledge:	Biological Sciences - Zoology
Abstract
Heptapterus collettii Steindachner, 1881, a catfish described fromLa Plata basin in South America, has a puzzling set of charactersfor Neotropical siluriforms. Examination of one syntype shows thatH. collettii does not belong to Heptapteridae or any otherNeotropical family but rather to Olyra, a genus of Bagridaeendemic to South Asia. Thus, it should be referred to as Olyracollettii. The species has nasal barbels on the posterior nares(shared with various Old-World catfish taxa), a wide separationbetween the anal and urogenital openings (shared with a largesubgroup of Bagridae) and a unique structure of the firstlateral-line ossicle (shared with species of Olyra). The speciesis similar to Olyra longicaudata, although there are significantmorphometric and meristic differences. Current problems in thetaxonomy of Olyra prevent conclusive resolution of the identity ofO. collettii. The presence of a species of Olyra in South Americais unlikely, and we consider this to be a result of mistakenlocality records. (AU)

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