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(Siluriformes: Trichomycteridae) from the Brazilian Amazon

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(Siluriformes: Trichomycteridae) from the Brazilian Amazon 161 Ichthyol. Explor. Freshwaters, Vol. 19, No. 2, pp. 161-166, 6 figs., 1 tab., June 2008 © 2008 by Verlag Dr. Friedrich Pfeil, München, Germany – ISSN 0936-9902 A new miniature species of Ammoglanis (Siluriformes: Trichomycteridae) from the Brazilian Amazon José L. O. Mattos*, Wilson J. E. M. Costa* and Cecile de S. Gama** Ammoglanis amapaensis, new species, is described from three drainages of the Brazilian Amazon: Jari, Amapari and Araguari. It is distinguished from other congeners by having nostril barbel long, reaching the posterior margin of the eye, cranial fontanel absent, and the anterior portion of the palatine with a small ossification. It seems to be more closely related to A. pulex, with which it shares a scythe-shaped lachrymal with an anterior facet and a short ventro-laterally directed process in the palatine. Introduction pulex, from the Orinoco River basin (Pinna, 1989; Costa, 1994; Costa & Bockmann, 1994; Pinna & The Sarcoglanidinae was created by Myers & Winemiller, 2000; Costa et al. 2004). A third new Weitzman (1966) to include two new genera and species of Ammoglanis, occurring in three different species of miniature trichomycterids, Sarcoglanis drainages of the Brazilian Amazon, is herein simplex and Malacoglanis gelatinosus, both from described. the Amazonian basin. Twenty-three years after, a third new genus and species of Amazonian sarcoglanidines, Stauroglanis gouldingi, was de- Material and methods scribed by Pinna (1989), who provided the first hypothesis of phylogenetic relationships among Measurements and counts follow Costa (1992). sarcoglanidine genera. Subsequent papers re- Measurements are presented as percentages of vealed three additional genera and five new standard length (SL), except subunits of the head species: Stenolicmus sarmientoi and Ammoglanis which are presented as percentages of head length diaphanus, from the Amazon River basin; Micro- (HL). Osteological preparations (c&s) were made cambeva barbata and M. ribeirai, from the coastal according to Taylor & Van Dyke (1985). Osteolo- plains of southeastern Brazil; and, Ammoglanis gical nomenclature follows Pinna (1989). Abbre- * Laboratório de Ictiologia geral e aplicada, Departamento de Zoologia, Universidade Federal do Rio de Janeiro, Caixa Postal 68049, CEP 21944-970, Rio de Janeiro, Brasil. E-mail: [email protected], [email protected] ** Instituto de Pesquisas Científicas e Tecnológicas do Estado do Amapá, Rod. Juscelino Kubitschek, Km 10, Fazendinha, CEP 68912-250, Macapá, Amapá, Brasil. E-mail: [email protected] Ichthyol. Explor. 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