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Armbruster, J. W. 1998.
Phylogenetic relationships of the suckermouth armored catfishes of the Rhinelepis group (Loricariidae: Hypostominae). Copeia 1998:620-636.

Abstract:
The loricariid catfish genera Pogonopoma, Pogonopomoides, Pseudorhinelepis, and Rhinelepis formed a monophyletic clade within the subfamily Hypostominae. Phyolgenetic analysis and morphological characters reveals the following relationships: (Pseudorhinelepis + (Rhinelepis + (Pogonopoma + Pogonopomoides))). These nodes are strongly supported with several synapomorphies, and each genus is redescribed and diagnosed. Phylogenetical analyses revealed a split between the Amazonian genus (Pseudorhinelepis ) and the remaider of the genera which occur in southeastern Brasil,

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