Navegando por Autor "DUTRA, Guilherme Moreira"

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Acesso aberto (Open Access)
Description of a new species of Ituglanis (Siluriformes: Trichomycteridae) from Serra dos Carajás, rio Tocantins basin
(2012-09) WOSIACKI, Wolmar Benjamin; DUTRA, Guilherme Moreira; MENDONÇA, Marina Barreira
A new species of Ituglanis is described from the rio Tocantins basin, State of Pará, Brazil. Ituglanis ina, new species, is distinguished from its congeners by the presence of a dark vertical bar over the base of the caudal-fin rays (vs. no bars over caudal-fin base); and by the presence of a middle trunk line of tiny neuromasts extending along the flank until the vertical through the dorsal fin, or near the caudal-fin base (vs. no middle trunk line of tiny neuromasts). Ituglanis ina can be further distinguished by a combination of characters related to color pattern and morphology. Comments on the relationship between Ituglanis species are presented.
Acesso aberto (Open Access)
A new miniature of Xenurobryconini (Characiformes: Characidae) from the rio Tapajós basin, Brazil
(Universidade Federal do Pará, 2016) MENDONÇA, Marina Barreira; PEIXOTO, Luiz Antônio Wanderley; DUTRA, Guilherme Moreira; NETTO-FERREIRA, André Luiz
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.
Acesso aberto (Open Access)
Rapid assessment of the ichthyofauna of the southern Guiana Shield tributaries of the Amazonas River in Pará, Brazil
(Instituto Nacional de Pesquisas da Amazônia, 2020-03) DUTRA, Guilherme Moreira; FREITAS, Tiago Magalhães da Silva; PRUDENTE, Bruno da Silveira; SALVADOR, Gilberto Nepomuceno; LEÃO, Manuela Dopazo de Vasconcellos; PEIXOTO, Luiz Antônio Wanderley; MENDONÇA, Marina Barreira; NETTO-FERREIRA, André Luiz; SILVA, Fabio Roberto Ribeiro da; MONTAG, Luciano Fogaça de Assis; WOSIACKI, Wolmar Benjamin
The Northern Pará Drainage System encompasses the left-bank tributaries of the Amazonas River in the southern Guiana Shield region of Pará state, Brazil. Five of the region’s state protected areas are considered strategic for the conservation of its biodiversity. In the present study, we assessed the ichthyofauna of the five state protected areas of the Northern Pará Drainage System. Seven expeditions were conducted between January 2008 and January 2009, which surveyed stretches of the Cuminá, Cuminapanema, Curuá, Jari, Mapuera, Nhamundá, and Paru rivers. These surveys yielded 286 species belonging to 38 families and eight orders, including seven new records of fish species for Brazil, six of which are also new records for the Amazon basin. Our results provide a valuable database for future research and conservation programs in the protected areas of the region.