As a follow-up to my last Travellers note book post, shown above:
In September 2022, Jon Armbruster was in Iquitos and collected several Hypoptopoma (visible HERE, and photo is linked below), very close to where we caught the fish pictured above. This led to a conversation on Facebook about these fish, wherein @The.Dark.One suggested the proper ID was Hypoptopoma psilogaster. This then led me to Aquino & Schaefer's 2010 paper (available HERE) on Hypoptopoma. Although the fish in my photo seem to have slightly more melanization of the caudal fin than you might expect based on the written description by Aquino & Schaefer, in general the pattern aligns with their Figure 23 of H. psilogaster (shown attached to this post). I agree with The.Dark.One that this is the correct ID.
This brings me back to our CLOG entry of Hypoptopoma cf_guianense. The CLOG page says they are occasionally exported out of Iquitos (which is the same location where H. psilogaster is found), and I see that the CLOG entry was created in 2011, only shortly after Aqunio & Schaefer's paper was published (and thus, was Aquino's paper taken into account when the H. cf_guianense CLOG entry was created?).
I'm now wondering if our H. cf_guianense CLOG entry should be incorporated into H. psilogaster. For those people familiar with those old imports of H. cf_guianense, is there any discriminating trait of those fish that proves they AREN'T H. psilogaster?
Jon Armbruster's photo in his Facebook post (in case some readers here don't have access to FB):
Aquino & Schaefer's 2010 image of H. psilogaster: