2009年8月25日 星期二

巴西馬德拉流域產蜓狀鯰(Acestridium)(綠色直升機)屬之兩新種

文獻來源: Reis, R.E. & Lehmann A., P. (2009): Two New Species of Acestridium Haseman, 1911 (Loricariidae: Hypoptopomatinae) from the Rio Madeira Basin, Brazil. Copeia, 2009 (3): 446-452.

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.