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Nannoptopoma, a New Genus of Loricariid Catfishes (Siluriformes: Loricariidae) from the Amazon and Orinoco River Basins

1996; American Society of Ichthyologists and Herpetologists; Volume: 1996; Issue: 4 Linguagem: Inglês

10.2307/1447654

1938-5110

Scott A. Schaefer,

Ichthyology and Marine Biology

Nannoptopoma, new genus, is proposed for two species of diminutive loricariid catfishes of the subfamily Hypoptopomatinae. Nannoptopoma spectabilis (Eigenmann), a species originally placed in the genus Otocinclus Cope, is known from the upper Amazon and Orinoco basins of Peru, Ecuador, Colombia, and Venezuela and is designated the type species. Nannoptopoma sternoptychum, new species, is described from tributaries of the Amazon River in F.uador, Brazil, and Peru and differs from its congener in terms of head shape, pectoral-fin length, and meristic features. Nannoptopoma is diagnosed among hypoptopomines by a number of osteological specializations. The new genus is most similar in external appearance to Hypoptopoma Giinther, yet lacks the pectoral spine serrae characteristic of the latter taxon. A sister-group relationship with Hypoptopoma within the tribe Hypoptopomatini is supported by shared homologies of the jaw suspensorium, opercular series and cranium. A key is provided to the species of Nannoptopoma and to genera of the tribe Hypoptopomatini. Nannoptopoma, genero nuevo, se propone por dos especies de bagres loricaridos diminutivos de la subfamilia Hypoptopomatinae. Nannoptopoma spectabilis (Eigenmann), describe originalmente en el genero Otocinclus Cope, conoce de las cuencas del alto Amazonas y Orinoco de Peru, Ecuador, Colombia y Vene