New Subfamily

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Delturus parahybae, photo by K.S. Cummings

Hemipsilichthys nimius, Photo by J.W. Armbruster

Armbruster (2004) determines that a clade consisting of Delturus and Hemipsilichthys (Upsilodus  is a synonym of Hemipsilichthys) form a monophyletic group sister to all other loricariids except Lithogenes.  A manuscript is currently in preparation by myself, Roberto Reis, and Edson Pereira, so limited information is provided here.  In my thesis (Armbruster, 1997), I mistakenly referred to the juvenile Delturus I had available as Upsilodus.


Both genera can be separated from all other loricariids by the presence of a postdorsal ridge made up of raised, median, unpaired plates and the presence of an adipose fin membrane. Upsilodus can be separated from Delturus by not having the anterior plates of the ridge contacting the lateral plates (juvenile Delturus also have this condition) and by having a rectangular (vs. V-shaped) spinelet.

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