I'm fairly sure they meant to label them as . However, pectorals are wrong. Look more like

Larry

The first fish was ordered as Lamontichthys filamentosus but is either Lamontichthys llanero or Lamontichthys stibaros anything I can look for besides the slight size difference?
There is an article that includes a dichotomous key for the genus. The citation is:

PAIXAO, Andrea de Carvalho and TOLEDO ...

... on traits that would distinguish them

The first fish was ordered as Lamontichthys filamentosus but is either Lamontichthys llanero or Lamontichthys stibaros anything I can look for besides the slight size difference?

The second fish was mixed with a bunch of Wild caught Hypancistrus sp(l201) and from ...

That Lamontichthys is probably L. stibaros based on being from Peru. L. filamentosus can also be found in peru, but it should also have longer filaments from its fins, although of course those could have been damaged. That's my guess, anyway.

eczs-1,

That yellow-finned one is a Lamontichthys species, possibly L.filamentosus which appears to have a yellow sheen in it's fins.

Regarding the new little fish, how about if you tell your fisherman that it seems like the species in question hails from Xingu? Not that this may necessarily be the ...

I have kept both non filamentosus lamontichthys. The black triangle on the side of the flank tends to be more concrete in stibaros. I'd agree that these were llanero.

Yes, Lamontichthys filamentosus

Hi!

Totally agree with Janne, this is a
Nice aquisition
Cheers
Yann