Delturinae

Hemipsilichthys is a genus of freshwater ray-finned fishes belonging to the family Loricariidae, the armoured suckermouth catfishes, and the subfamily Delturinae, the primitive suckermouth catfishes. These wide-mouthed freshwater catfishes are restricted to southeast Brazil in the Paraíba do Sul, Perequê-Áçu and Taquari river basins. Hemipsilichthys, along with Delturus, form a clade (Delturinae). In these two genera, members have a ridge behind their dorsal fin and an adipose fin membrane. However, in Hemipsilichthys, the dorsal fin membrane and most anterior plate of the adipose fin do not t

Delturus is a genus of freshwater ray-finned fishes belonging to the family Loricariidae, the suckermouth armored catfishes. It is the type genus of the subfamily Delturinae, the catfishes in this subfamily are known as primitive suckermouth catfishes. These catfishes are endemic to Brazil.

Delturinae is a subfamily of freshwater ray-finned fishes belonging to the family Loricariidae, the armored suckermouth catfishes including two genera, Delturus and Hemipsilichthys, these are collectively known as the primitive suckermouth catfishes. This group is sister to all other loricariids except Lithogenes. The geographical distribution of Delturinae, exclusively on the southeastern Brazilian Shield, indicates southeastern Brazil acts as either a refugium for basal loricariid taxa or a point of origin for the Loricariidae.