Two New Species of Acestridium Haseman, 1911 (Loricariidae: Hypoptopomatinae) from the Rio Madeira Basin, Brazil
Roberto E. Reis and Pablo Lehmann A.
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.
Copeia 2009, No. 3, 446–452