Hypoptopoma near Iquitos

Incorrect ID? New info to be added, taxonomic revisions and any kind of changes to the data we currently hold in here please!
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bekateen
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Hypoptopoma near Iquitos

Post by bekateen »

bekateen wrote: Fri Aug 12, 2022 5:52 pm Can I get a confirm on ID for this hypoptopomatine? I believe they are Hypoptopoma cf_guianense. We caught a lot of these along the Nanay. The color on the caudal peduncle and two tail lobes seem helpful. There's a very rudimentary adipose fin.

Thanks, Eric
20220812_112947_2.jpg
20220812_112756_2.jpg
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?

Cheers, Eric

Jon Armbruster's photo in his Facebook post (in case some readers here don't have access to FB):
Image

Aquino & Schaefer's 2010 image of H. psilogaster:
Fig. 23. Hypoptopoma psilogaster, ANSP 180654, 59.2 mm SL, female, in dorsal, lateral, and ventral views.
Fig. 23. Hypoptopoma psilogaster, ANSP 180654, 59.2 mm SL, female, in dorsal, lateral, and ventral views.
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Re: Hypoptopoma near Iquitos

Post by Jools »

I kept them separate at the time because of differing, IIRC, caudal and dorsal fin patterning given the same low body height. I didn't put them in H. guianense because of geography. Given the very sound reasoning/research posted, I think you could safely put the H. cf_guianense pictures into H. psilogaster.

However, what about the picture already in there (should it go into H. sp(2))? Also, a least H. sp(2) is from Iquitos (including some I collected there). The other H. sp(x) I do not have locality data for.

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Re: Hypoptopoma near Iquitos

Post by bekateen »

Jools wrote: Mon Sep 19, 2022 1:45 pmI kept them separate at the time because of differing, IIRC, caudal and dorsal fin patterning given the same low body height. I didn't put them in H. guianense because of geography. Given the very sound reasoning/research posted, I think you could safely put the H. cf_guianense pictures into H. psilogaster.
Hi Jools. Okay, that's helpful. I've combined the photos, keepers, spotters, etc. of the former H. cf_guianense into H. psilogaster. I also stripped the remaining info out of the old H. cf_guianense CLOG page and renamed it Corumbataia liliai (which will now require a CLOG page edit approval from you. I updated some of the info to overwrite the old CLOG data on that entry).
Jools wrote: Mon Sep 19, 2022 1:45 pmHowever, what about the picture already in there (should it go into H. sp(2))? Also, a least H. sp(2) is from Iquitos (including some I collected there).
I think that's reasonable for one main goal. The singular photo we had before of H. psilogaster did not clearly show any good markings on the tail because the tail is compressed. It seems that the fish on Hypoptopoma sp(2) don't have conspicuous melanization of the tail either, so that should be good. It could well be that the H. sp(2) is just an undercolored H. psilogaster, but keeping the pics separate until a broader understanding of variability of pigmentation is helpful.

Cheers,
Eric
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