Redescription of the type species of Odontostilbe Cope, 1870 (Teleostei: Characidae: Cheirodontinae), and description of three new species from the Amazon basin

Abstract

The widespread Neotropical cheirodontine Odontostilbe fugitiva is reviewed, and three new species of the genus are described from the Amazon basin. A neotype is designated for O. fugitiva, from the mouth of the río Mazán, upper río Amazonas basin, Peru. Three nominal species are herein considered as synonyms of O. fugitiva: O. madeirae, O. drepanon, and O. caquetae. The three new species are respectively O. ecuadorensis from the río Napo basin, O. nareuda from the rio Madeira basin, and O. parecis from the rio Guaporé basin (rio Madeira basin). Among other diagnostic characters, gill rakers are especially informative in distinguishing species. Description of gill raker denticulation is provided for the first time for species of the Cheirodontinae. Secondary sexually dimorphic characters are described for all species.O queirodontíneo neotropical Odontostilbe fugitiva, de ampla distribuição, é revisado e três espécies novas são descritas para o gênero na bacia Amazônica. Um neótipo é designado para O. fugitiva, da boca do rio Mazán, alto rio Amazonas, Peru. Três espécies nominais são consideradas sinônimas de O. fugitiva: O. madeirae, O. drepanon e O. caquetae. As três espécies novas são, respectivamente, O. ecuadorensis da bacia do rio Napo, O. nareuda da bacia do rio Madeira e O. parecis da bacia do rio Guaporé (bacia do rio Madeira). Entre outros caracteres diagnósticos, os rastros branquiais são especialmente informativos para distinguir as espécies. Uma descrição da denticulação dos rastros branquiais é apresentada pela primeira vez para espécies de Cheirodontinae. Caracteres de dimorfismo sexual secundário são descritos para todas as espécies.

Comparative morphology of gill glands in externally fertilizing and inseminating species of cheirodontine fishes, with implications on the phylogeny of the family Characidae (Actinopterygii: Characiformes)

“…3); for six species of externally fertilized cheirodontines, Odontostilbe ecuadorensis (Bührnheim & Malabarba, 2006: fig.16), O. fugitiva (Bührnheim & Malabarba, 2006: fig.3), O. parecis (Bührnheim & Malabarba, 2006: fig.16, p.92), O. pulchra (Bührnheim & Malabarba, 2007: fig. 7), O. splendida (Bührnheim & Malabarba, 2007: fig.…”

Reproductive period, fecundity and histology of gonads of two cheirodontines (Ostariophysi: Characidae) with different reproductive strategies - insemination and external fertilization

“…The members of this tribe also show specialized organs in the caudal fin of the males that vary from the presence of modified scales to the presence of hypertrophied tissues apparently of glandular function (Malabarba & Weitzman, 1999Malabarba et al, 2004). Odontostilbe pequira (Steindachner, 1882) is a member of some basal genera of the cheirodontines that have little sexual dimorphism and are all externally fertilized (Malabarba, 1998;Bührnheim & Malabarba, 2006).…”

Review of the species of the genus Serrapinnus Malabarba, 1998 (Teleostei: Characidae: Cheirodontinae) from the rio Tocantins-Araguaia basin, with description of three new species

“…This conforms to the pattern of ichthyofauna endemism in the Tocantins basin discussed by Bertaco & Carvalho (2010) and Bertaco et al (2011) who listed 42 species endemic to the upper portions of the rio Tocantins system. Species of Odontostilbe are relatively common and abundant across the Amazon basin (Bührnheim & Malabarba, 2006), in the río Orinoco drainage (Bührnheim & Malabarba, 2007) and in the Paraná-Paraguay basins (Malabarba, 2003). There is, however, a remarkable absence of records of this genus in the Tocantins-Araguaia basin.…”