Species of Microglanis?

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dmcat
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Species of Microglanis?

Post by dmcat »

Hi All,
I have had two Microglanis specimens for several years. One looks similar to M. iheringi, but the second one (on image) has a bit different pattern of coloration. Though I am not sure how variable the pattern within the species is. I would appreciate any opinion on its identity.
Thanks,
DM
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bekateen
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Re: Species of Microglanis?

Post by bekateen »

Hi DM,

:YMDEVIL: Wishful thinking that it would be so easy! Ha Ha Ha Ha Ha!

Seriously though, thanks for sharing. Since last summer, Microglanis have been my obsession and I've spent (literally) weeks worth of my waking hours trying to learn all I can about them. The fruit of that labor is that here on Planetcatfish, the Microglanis genus is relatively well-populated with photo examples and information (https://www.planetcatfish.com/common/ge ... d=106#3772). :-)

To answer your question, first I must ask, did you buy this fish at the same time as you did the other?

There are a lot of Microglanis coming into the United States, almost always sold as Microglanis iheringi or Microglanis poecilus. That's because those two species are reportedly found in waterways shared by Eastern Columbia and Southern Venezuela, and from the region around Leticia in Southern Colombia. The fish are getting exported from these areas, so the exporters slap one of those two names on the fish. But M. poecilus looks nothing like these, so that ID can't be correct.

Right now, I've got 44 fish (all sold as the same species) from the same supplier, and I'm convinced I've got at least 3, maybe 4 species mixed together (see here: viewtopic.php?f=7&t=49481). A sample of the variation in my group is shown in the image attached to this post.

The best answer I can give you is this: Assuming your fish came out of the same area, it would most likely get ID'd as M. iheringi. But the break in the brown saddle under the dorsal fin and the incomplete brown bar between the adipose and anal fins indicate to me that this fish is not M. iheringi. That said, if you ask the scientists working on Microglanis, for now, their published data suggest that M. iheringi is a highly variable species spread over a wide area. (to me, that's code for "it's probably more than one species, but we don't have the evidence yet." =)) )

I hope that's helpful and clear... at least as clear as mud.

Cheers, Eric
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dmcat
Posts: 100
Joined: Wed Jan 07, 2015 5:36 am
My images: 53
My cats species list: 147 (i:10, k:50)
Spotted: 86
Location 1: USA
Location 2: Georgia

Re: Species of Microglanis?

Post by dmcat »

Many thanks, Eric! You truly did a job digging through uncertainties of Microglanis systematics.
Answering to your question: yes, I bought both at the same time. That was back in 2015... Interestingly, all (about 7) specimens at the store were like the one I've pictured and only one that looked "common to me, i.e. with complete brown band from the adipose to anal fins". And I bought one of each.
Cheers,
DM
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