Upsilodus A. Miranda Ribeiro, 1924

Hemipsilichthys nimius, Photo by J.W. Armbruster

Armbruster (1997, 2004) determined that a clade consisting of Delturus and Upsilodus (Upsilodus  may be synonymous with Hemipsilichthys gobio) form a monophyletic group sister to all other loricariids.  A manuscript is currently in press 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


Upsilodus Miranda Ribeiro 1924



Hemipsilichthys can be separated from nearly all other loricariids except Delturusby the presence of a postdorsal ridge made up of raised, median, unpaired plates and the presence of an adipose fin membrane. Hemipsilichthys can be separated from Delturus by not having the posterior membrane of the dorsal fin contacting the anteiormost preadipose plate.

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