Zootaxa, Osteoglossum Species

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Zootaxa 1239: 49–68 (2006) ISSN 1175-5326 (print edition) www.mapress.com/zootaxa/ ZOOTAXA 1239 Copyright © 2006 Magnolia Press ISSN 1175-5334 (online edition) Quantitative analysis of interspecific and ontogenetic variation in Osteoglossum species (Teleostei: Osteoglossiformes: Osteoglossidae) MARIA EDUARDA CASTRO LEAL1 & VIVIANNE BERNARDO DE SANT-ANNA2 1.Department of Zoology, Universidade do Estado do Rio de Janeiro, rua São Francisco Xavier 524, Maracanã, Rio de Janeiro, Brazil 2Department of Zoology, Universidade do Estado do Rio de Janeiro, rua São Francisco Xavier 524, Maracanã, Rio de Janeiro, Brazil Abstract Patterns of interspecific and intraspecific variation were investigated on samples of postembryos, juveniles, and adults of the two species of the osteoglossid genus Osteoglossum (O. bicirrhosum and O. ferreirai). Twenty-two morphometric characters were analyzed, utilizing principal component analysis (PCA) that discriminate ontogenetic classes and between species. The results showed differences in both categories. Morphometric characters related to dorsal and anal fin lengths proved to be the most important in taxonomic recognition. The comparison of growth trajectories for these characters showed that growth offset for O. bicirrhosum overlaps with growth onset for O. ferreirai, which may be indicative of a peramorphic morphology in the latter species. Key words: Osteoglossum, PCA, morphometrics, ontogeny, heterochrony, taxonomy Introduction The osteoglossomorph genus Osteoglossum contains two nominal species, the silver arowana, O. bicirrhosum Cuvier, 1829, and the black arowana, O. ferreirai Kanazawa, 1966. The genus is easily recognized by general osteoglossid features, such as: body covered with very large scales; mouth wide and oblique, with lower jaw prominent and terminal; two barbels at the extremity of the lower jaw; and dorsal and anal fins almost fused with the caudal fin (Figure 1a, 1b). Both species are important in the fisheries industry, particularly O. bicirrhosum, as well as the home aquarium market (Ferraris, 2003), and are protected by Brazilian Federal Laws. Osteoglossum bicirrhosum has a widespread distribution, occurring in the Amazon and western Orinoco river basins, and Accepted by C. Gilbert: 15 May 2006; published: 21 Jun. 2006 49.

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