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A new miniature of Xenurobryconini (Characiformes: Characidae) from the rio Tapajós basin, Brazil Neotropical Ichthyology
Mendonça,Marina Barreira; Peixoto,Luiz Antônio Wanderley; Dutra,Guilherme Moreira; Netto-Ferreira,André Luiz.
Abstract A new species of Xenurobrycon isdescribed from tributaries of the rio Tapajós, Pará, Brazil. It is diagnosed from all congeners by the dark color of the posterior half of both caudal-fin lobes, the presence of infraorbitals one, two, and three, the presence of a set of lamellar processes on eighth principal caudal-fin ray of mature males, the presence of bony hooks similar in size or decreasing posteriorly on last unbranched and first 9-12 branched anal-fin rays of mature males, the presence of only conical teeth on both jaws, the lack of the adipose fin and the presence of 15-18 predorsal scales. The description of the new species increases the number of species in Xenurobrycon to six. An updated key to the species of the genus is provided.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Key to species; Miniaturization; Ostariophysi; Sexual dimorphism; Taxonomy.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000100004
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Description of a new species of Tetranematichthys (Siluriformes: Auchenipteridae) from the lower Amazon basin, Brazil Neotropical Ichthyology
Peixoto,Luiz Antônio Wanderley; Wosiacki,Wolmar Benjamin.
Tetranematichthys barthemi is described from the mouth of the rio Trombetas and related tributaries (rios Saracá and Araticum) and rio Urubu, tributary of the rio Amazon. Tetranematichthys barthemi shares with its congeners the anterior alignment of the mandibular barbels and well-developed portion of the protractor hyoid muscle connected to the mandibular barbel. It is distinguished from these species by a serrated anterior margin on the distal portion of the mandibular barbel, different from the more derived state which is composed of conspicuous digitiform elaboration in the distal portion of the barbel. Tetranematichthys barthemi can also be distinguished from its congeners by combination of characters related to morphometry and coloration pattern....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Neotropical; Systematics; Catfishes; Auchenipterinae; Lower Amazon.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000100009
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