Resumo
Two new species of Bujurquina are described from the Bolivian Amazon basin. The first new species inhabits the Beni River drainage and is distinguished from its congeners in the combination of the following characters: longer snout, deeper head, body and caudal peduncle, shorter pectoral fin, more scales in the E1 series, discontinuous longitudinal band, bars 5 and 6 not fused, preopercular spot and coloration pattern on flank scales absent. The second new species inhabits the Mamoré and Iténez river drainages, and differs from its congeners in the combination of the following characteristics: longer and deeper head, longer snout and pectoral fin, deeper caudal peduncle, fewer scales in the E1 series and lower lateral line, preopercular spot absent, bars 6 and 7 separated from longitudinal band and discontinuous longitudinal band. An identification key for species reported from Bolivia and complementary morphological data for B. oenolaemus and B. vittata are presented.
Se describen dos especies nuevas de Bujurquina para la cuenca Amazónica de Bolivia. La primera nueva especie habita la cuenca del Río Beni y se distingue de sus congéneres en la combinación de los siguientes caracteres: hocico más largo, cabeza, cuerpo y pedúnculo caudal más bajos, aleta pectoral más corta, mayor número de escamas en la serie E1, banda longitudinal discontinua, barras 5 y 6 no fusionadas, mancha preopercular y patrón de coloración en las escamas de los flancos ausentes. La segunda nueva especie habita las cuencas de los ríos Mamoré e Iténez, y se diferencia de sus congéneres en la combinación de las siguientes características: cabeza más larga y alta, hocico y aleta pectoral más largos, pedúnculo caudal más alto, menor número de escamas de la serie E1 y de la línea lateral inferior, ausencia de la mancha preopercular, barras 6 y 7 separadas de la banda longitudinal y banda longitudinal discontinua. Se presenta una clave de identificación de las especies de Bolivia y datos morfológicos complementarios de B. oenolaemus y B. vittata.
Assuntos
Animais , Ciclídeos/classificação , Biodiversidade , BolíviaResumo
The Araguaia River is an important watercourse located in Central Brazil and well known for its diversity of fish fauna. Differences between landscape and resources in the distinct environments existing in a floodplain can determine the success of a species. This study presents a list of ichthyofauna species found in lentic and lotic environments in the floodplain of the Araguaia River basin, bordering Mato Grosso and Goiás States. We carried out sampling in July 2019, during the dry season, using diverse fish collection strategies, such as waiting nets, trawl, cast net and fishing rods. Were distributed 12 sampling points between lentic and lotic environments and we captured a total of 168 individuals of 42 species, 19 families and six orders. The predominant orders were Characiformes, Siluriformes and Cichliformes, while the families were Serrasalmidae, Characidae, Triportheidae, Curimatidae and Anostomidae. The genera Triportheus, Psectrogaster and Moenkhausia were the most abundant, while Pimelodus was the most dispersed. Results showed greater abundance and diversity in the lentic environment than in the lotic one, with top-of-the-chain species in both. The variance between environments and the presence of species that are endemic, recently described, of undefined taxonomic status, and bioindicators, highlight the importance of conserving and further studying the ichthyofauna in the Araguaia River basin.(AU)