Now the point at which the controversy may have started,
was a discussion in the PlanetCatfish forums regarding
the "Black Cory and origin, it was mentioned that
there was a dark form of another C. aeneus type
we now know as C. venezuelanus that came from
the Northern Guarico State of Venezuela and it is possible
that this discussion triggered the confusion.
The dark form of C. venezeulanus
have never commercially entered the hobby. If you are
having trouble distinguishing one from the other, here
is a simple guide. Young C. schultzii "Black"
tend to have all reddish fins which darken with maturity.
C. venezuelanus look very similar to the young
C. schultzii "Black". However both
the normal C. venezuelanus we see in the hobby,
and the dark form have reddish dorsal and adipose fins,
but the caudal, anal and ventral fins are grey.