Pseudacanthicus major, new species (Loricariidae)

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Pseudacanthicus major, new species (Loricariidae)

Post by lfinley58 »

Chamon, C.C. & Silva, T.C. 2018. Pseudacanthicus major: description of one of the largest known Loricariidae (Hypostominae: Ancistrini), a species from rio Tocantins basin, Brazil. Zootaxa, Volume 4387, Number three: 499-510.

Abstract:
The genus Pseudacanthicus currently comprises the following six [sic] species distributed in the Amazon and Tocantins basins, and coastal drainages from Guyana to French Guyana: P. serratus, P. fordii, P. histrix, P. spinosus, P. leopardus, P. pitanga, and P. pirarara. Herein we describe P. major, from rio Tocantins basin, one of the largest loricariid species known. The new species is distinguished from its congeners by the following combination of characters: having body color pattern with dark brown background without spots or blotches and dorsal and caudal fins with transversal white bands; anterior process of compound pterotic with no contacting with the posterior margin of the orbit and by the absence of a conspicuous crest on the posterior edge of parieto-supraocciptal. Other osteological characteristics are further used to diagnose P. major from others congeners. A discussion on gigantism and miniaturization in freshwater fish, ornamental fisheries activities, threats and conservation of the new species are also provided.

http://www.mapress.com/j/zt/article/vie ... a.4387.3.5
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Re: Pseudacanthicus major, new species (Loricariidae)

Post by bekateen »

Holy cow! I was just searching databases less than an hour ago! How did I miss this?!? :-O :-\ 8-} :)) :))
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Re: Pseudacanthicus major, new species (Loricariidae)

Post by lfinley58 »

Time can be tricky - so much can happen in so little of it.

Re all of the genetic papers that you made note of - Interesting stuff!

Lee
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Re: Pseudacanthicus major, new species (Loricariidae)

Post by bekateen »

lfinley58 wrote: Wed Feb 28, 2018 2:18 amTime can be tricky - so much can happen in so little of it.
True, so true. :-D
lfinley58 wrote: Wed Feb 28, 2018 2:18 amRe all of the genetic papers that you made note of - Interesting stuff!
Thanks, I just happened upon a publication of abstracts from a meeting. Lucky us so many papers studied catfish.

And to be honest, I only listed abstracts which have the word "Siluriformes" in their title. If any abstracts in that journal issue failed to use that word, I missed them. Maybe there are more gems to be found there... and it'd be easier if you speak Portuguese. :-)

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Re: Pseudacanthicus major, new species (Loricariidae)

Post by lfinley58 »

Hi all.

The largest size listed for this species is 540 mm (21.3 inches) Standard Length!
Lee
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Re: Pseudacanthicus major, new species (Loricariidae)

Post by bekateen »

Is this fish L186?
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Re: Pseudacanthicus major, new species (Loricariidae)

Post by lfinley58 »

Hi Eric,
Our minds are working together. I am just coming on to the site to note that the paper states that this fish is known by aquarists as L186.
In Ingo's Back to Guide to L-Catfishes he also notes that the number L064 is also applicable to this fish.
Lee
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Re: Pseudacanthicus major, new species (Loricariidae)

Post by lfinley58 »

OOPs!
Regarding the size attained by this species: I initially missed seeing that one of the paratypes is 600 mm (23.6 inches) Standard Length. Sorry about that.
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Re: Pseudacanthicus major, new species (Loricariidae)

Post by bekateen »

Hi Lee,

I do not have access to this journal. If you have a copy, may I get it?

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Re: Pseudacanthicus major, new species (Loricariidae)

Post by lfinley58 »

Hi Eric,
It will be on the way. I'll use the address in the Sacramento Tropical News member list.

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Re: Pseudacanthicus major, new species (Loricariidae)

Post by bekateen »

Thanks Lee.
lfinley58 wrote: Wed Feb 28, 2018 5:08 pmI'll use the address in the Sacramento Tropical News member list.
How did you find that? :-) Do you get our monthly newsletter? ... :-\ *moment of silence while I look in a recent newsletter... :-O You do! Ha! Wonderful. We should try and get you back sometime. :-)

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Re: Pseudacanthicus major, new species (Loricariidae)

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I changed the name from L186 to Pseudacanthicus major.
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Re: Pseudacanthicus major, new species (Loricariidae)

Post by lfinley58 »

Hi Eric,
In this vein you might want to retire L64 also.

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Re: Pseudacanthicus major, new species (Loricariidae)

Post by lfinley58 »

Hi yet again Eric.
I look forward to the club magazine each month. I really need to write something for it.
It may sound a bit clumsy, but it is an honor to be an honorary member of the club.
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Re: Pseudacanthicus major, new species (Loricariidae)

Post by bekateen »

lfinley58 wrote: Wed Feb 28, 2018 5:34 pmIn this vein you might want to retire L64 also.
Lee, I'm afraid that's above my pay grade and skill set. (1) The authors of this paper did not equate L064 with P. major, so without authority to do so, I hesitate. And (2) It's very easy to rename an existing entry in the CLOG, but fusing one to another, and transferring the registered users, is a little more complex. It might be within my powers, but given concern (1) I'd rather let the Gods of the internet handle this. :-)

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Re: Pseudacanthicus major, new species (Loricariidae)

Post by lfinley58 »

Hi Eric,
I see where you are coming from with that situation.
I had mentioned Ingo's book using both numbers and double checked with the Wels Atlas Band 2 by him and Evers, who had basically the same info, apparently considering the L64 as the juvenile of L186.
Maybe we can get some feedback from others on this situation.
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Re: Pseudacanthicus major, new species (Loricariidae)

Post by Jools »

You're right to be cautious Eric. L063, L064 and L186 have mixed up pictures in our database. It is messy and I need some time to unpick it. As you say, once you combined registered keepers, you can't then separate them out again.

I am comfortable the described fish is L064 if we're going on the picture of the adult in the paper. However, I don't see the white bands in the caudal the paper describes. The picture of the holotype I am less certain of but again it looks more like L064 and than L186.

I would value @acanthicus 's perspective.

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Re: Pseudacanthicus major, new species (Loricariidae)

Post by Acanthicus »

Hi

L 64 and L 186 are the same species in my opinion, pretty sure about that. L 64 was published as being from Rio Tocantins, L 186 as being from Rio Tocantins near Cametá, so how should anyone distinguish those two l-numbers, it's impossible. The shown specimens look very, very similar to each other, having in mind one was photographed in Brazil, and one in Germany even the differences in colour are easily explained.

The shown, but released specimen in the paper therefore matches both l-numbers very well, the white caudal bands are not as clear as they are in Panaqolus or Hypancistrus and fragmented, but still there I'd say. "Bands" is possibly not the best term to describe the pattern.

Hope that is of any help?
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Re: Pseudacanthicus major, new species (Loricariidae)

Post by bekateen »

Acanthicus wrote: Fri Mar 02, 2018 2:36 pmL 64 and L 186 are the same species in my opinion, pretty sure about that. L 64 was published as being from Rio Tocantins, L 186 as being from Rio Tocantins near Cametá, so how should anyone distinguish those two l-numbers, it's impossible. The shown specimens look very, very similar to each other, having in mind one was photographed in Brazil, and one in Germany even the differences in colour are easily explained.
Thanks Acanthicus.

Jools wrote: Thu Mar 01, 2018 10:57 amI am comfortable the described fish is L064 if we're going on the picture of the adult in the paper. However, I don't see the white bands in the caudal the paper describes. The picture of the holotype I am less certain of but again it looks more like L064 and than L186.
Jools, from Ancanthicus' and your comments above, it seems that the two photos for L064 are indeed correctly labeled. Is it safe for me to combine L064 into the new species?

Jools wrote: Thu Mar 01, 2018 10:57 amYou're right to be cautious Eric. L063, L064 and L186 have mixed up pictures in our database...
From the details above, should I interpret your comment about "mixed up pictures in the database" to refer to L063? Do you think L063 should be combined with P. major?

Enjoy your BFD, and safe travels.

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Re: Pseudacanthicus major, new species (Loricariidae)

Post by Acanthicus »

Hi again

L 63 is different to P. major, dont combine them please, its another species for sure.

(Btw: The photos I referred to were the ones from the DATZ publication, not from the cat e log.)

Have a good time!
Daniel
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