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3 September 2009 Two New Species of Acestridium Haseman, 1911 (Loricariidae: Hypoptopomatinae) from the Rio Madeira Basin, Brazil
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Abstract

Acestridium gymnogaster and A. scutatum are described as new from small tributaries to the middle Rio Madeira, Amazonas, Brazil. Acestridium gymnogaster is most similar to A. discus from which it differs in the number of medial unpaired predorsal plates, the arrangement of chromatophores in predorsal area, and the absence of contact midventrally between the lateral abdominal plates. Acestridium scutatum is most similar to A. triplax from which it differs in having a longer snout and by the shape of the preanal plate. A key to the species of Acestridium is provided.

Acestridium gymnogaster e Acestridium scutatum, espécies novas, são descritas de pequenos rios tributários do médio Rio Madeira, Estado do Amazonas, Brasil. Acestridium gymnogaster é mais semelhante à A. discus, de quem difere pelo número de placas ímpares médias pré-dorsais, arranjo dos cromatóforos na área pré-dorsal, e a ausência de contato entre as placas laterais abdominais na linha media. Acestridium scutatum é mais semelhante à A. triplax, de quem difere por ter o focinho mais longo e pela forma da placa pré-anal. Uma chave para as espécies de Acestridium é apresentada.

2009 by the American Society of Ichthyologists and Herpetologists
Roberto E. Reis and Pablo Lehmann A "Two New Species of Acestridium Haseman, 1911 (Loricariidae: Hypoptopomatinae) from the Rio Madeira Basin, Brazil," Copeia 2009(3), 446-452, (3 September 2009). https://doi.org/10.1643/CI-08-150
Received: 26 August 2008; Accepted: 1 January 2009; Published: 3 September 2009
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