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| Campos-da-Paz,Ricardo. |
| Recent study of the type-material of Tembeassu marauna, a poorly-known species currently represented in collections only by its holotype (male) and paratypes (male and female), all collected forty years ago at the Ilha Solteira reservoir area, upper Paraná river region, revealed an unique pattern of dental arrangement among members of the order Gymnotiformes. This autapomorphic condition refers to a patch of around 15 elongate conical, extra teeth associated to soft tissue, and disposed inside the mouth on a restricted area at the roof of oral cavity and located just in front of the premaxillary bones (although clearly apart from those). Besides this obvious feature, two additional conditions are recognized as possibly unique for T. marauna, which refer to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Apteronotus; Gymnotiforms; Mouth; Osteology; Teeth; Upper Paraná. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252005000300007 |
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| Ceneviva-Bastos,Mônica; Casatti,Lilian; Rossa-Feres,Denise Cerqueira. |
| The habitat use and feeding habits of a set of nektonic fish species often found in small low-gradient streams in Brazil were investigated. The core species in the present study was Knodus moenkhausii (Eigenmann & Kennedy, 1903), the most abundant of five species in the nektonic guild. Records of the species in 22 streams indicate that K. moenkhausii is associated, on a mesohabitat scale, with runs, and on a microhabitat scale, with sandy bottoms, intermediate depth, and open sites without coverage or submerged vegetation. During snorkeling observations, two additional nektonic registered species showed spatial segregation from K. moenkhausii with respect to foraging microhabitats. Feeding habits of the observed nektonic species were significantly... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Characidae; Habitat use; Resources; Upper Paraná. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000200006 |
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