Revision of Panaque

[Silurus]

Lujan, NK, M Hidalgo & DJ Stewart, 2010. Revision of Panaque (Panaque), with descriptions of three new species from the Amazon basin (Siluriformes, Loricariidae). Copeai 2010: 676–704.

Abstract

The Panaque nigrolineatus group (subgenus Panaque) is revised; three nominal species—P. cochliodon, P. nigrolineatus, and P. suttonorum—are redescribed and three new species are described. Panaque armbrusteri, new species, is widespread in the Tapajós River and its tributaries in Brazil and is distinguished by having a supraoccipital hump, higher numbers of jaw teeth and an ontogenetic increase in interpremaxillary and intermandibular tooth-row angles, relatively short paired-fin spines, and dorsal margin of infraorbital six flared laterally. Panaque schaeferi, new species, is widespread in main-channel habitats of the upper Amazon (Solimões) River basin in Brazil and Peru; it is distinguished by having a coloration consisting of dark or faded black spots evenly distributed on a pale gray to brown base, and by its large adult body size (>570 mm SL). Panaque titan, new species, is distributed in larger, lowland to piedmont rivers of the Napo River basin in Ecuador, and is distinguished by having a postorbital pterotic region bulged beyond the ventral pterotic margin, coloration consisting of irregular and widely spaced dark gray to brown stripes on light brown to tan base, and large adult body size (>390 mm SL). A relatively large pterotic, indicative of an enlarged gas bladder and gas bladder capsule, and allometric increases in tooth number are hypothesized to be synapomorphies uniting members of the subgenus Panaque.

[Jools]

If anyone has a PDF I'd be very grateful!

Jools

[matthewfaulkner]

Me too!

[Suckermouth]

Oh sweet, I was wondering when this was going to be published.

[Silurus]

Jools, the pdf is on its way.

This is Panaque armbrusteri, and this might be P. titan.

[matthewfaulkner]

The Panaque nigrolineatus group (subgenus Panaque)

This confused me a little. I thought Panaque was the genus? Please forgive my layman's understanding of taxonomy.

[Suckermouth]

The Panaque nigrolineatus group (subgenus Panaque)

This confused me a little. I thought Panaque was the genus? Please forgive my layman's understanding of taxonomy.

Panaque, under the way Lujan et al. is referring to it (and as Armbruster 2004 did previously) is divided into 3 subgenera, Panaque (royal plecs and other large Panaque), Panaquolus (or however it's spelled) (clown plecs and other dwarf Panaque), and Scobinancistrus. This paper only studies the large Panaque.

[Silurus]

Me too!

Sorry, don't have your email address.

[MatsP]

Me too!

Sorry, don't have your email address.

Matthew's e-mail address is available as email-icon next to the PM-icon in the info section to the right of the post.

And while you are at e-mailing these out, I wouldn't mind a copy too...

--
Mats

[taksan]

Jools, the pdf is on its way.

This is Panaque armbrusteri, and this might be P. titan.

Not what I think of as a Titanic Panaque ....

[racoll]

Not what I think of as a Titanic Panaque ....

I don't think scientists much care what aquarists think.

[taksan]

Not what I think of as a Titanic Panaque ....

I don't think scientists much care what aquarists think.

Maybe we should offer them the same courtesy.

[Birger]

Not what I think of as a Titanic Panaque ....

That is the bane of common names...

Maybe we should offer them the same courtesy.

Please don't say "we" PlanetCatfish is often in contact with these "scientists" and many are quite accomodating, as a matter of fact some are members.

Birger

[Shane]

The redescriptions of P. cochliodon and suttonorum will be very interesting, esp if they were able to obtain new specimans of the later sp. HH, pls include me on your mailing list.
-Shane

[racoll]

Please don't say "we" PlanetCatfish is often in contact with these "scientists" and many are quite accomodating, as a matter of fact some are members.

Well put. Many scientists have been really supportive, having donated both photos and their time into this website.

We should not want that jeopardised by criticising their work.

[MatsP]

We should not want that jeopardised by criticising their work.

I agree in that we shouldn't criticise when it's not deserved. I think we SHOULD criticise where it's deserved. Naming a fish so that it resembles the common name of another species is somewhere inbetween.

--
Mats

[Silurus]

Naming a fish so that it resembles the common name of another species is somewhere in between.

Common names do not exist as far as scientists are concerned, so this is not an issue (for them).

[husky_jim]

From what i 've read L203 is Panaque schaeferi...what do you think?

I am really confused about the P.Titan...i have to read more carefully....The Armbrusteri is crearly the sp.Tapajos as already mentioned....
very interesting.....

[husky_jim]

As Silurus said

L418

fits the "Titan" description.....

[Jools]

Maybe we should offer them the same courtesy.

Absolutely not, I, and thus PlanetCatfish.com as long as this is my site, am entirely opposed to such a view. And, FWIW, I think ichthyologists ignore aquarists to the detriment of their studies. In my view each has quite a lot to gain from the other.

However, in anyone's book, common names are mostly fluff. Easy, useful fluff, but fluff. I mean, I thought up "Three Beacon Pleco" in the pub...

Jools

PS Thanks for the PDF everyone.

[Jools]

The Armbrusteri is clearly the sp.Tapajos as already mentioned....
very interesting.....

Mmmm, but it also recongished that the species from the Tocantins and the Xingu and places them very close to

Panaque armbrusteri

. I will am tempted to follow with the Tocantins fish but leave the Xingu fish out on its own.

Interesting to note the Madre de Dios fish is covered too.

Actually, the blue eye pleco stuff in there is really interesting too.

Jools

[MatsP]

I would also say that Nathan Lujan and Max Hidalgo are definitely not "anti-aquarists" - I've never met either, but we've communicated over the internet many times, and they are most helpful.

--
Mats

[taksan]

We should not want that jeopardised by criticising their work.

I agree in that we shouldn't criticise when it's not deserved. I think we SHOULD criticise where it's deserved. Naming a fish so that it resembles the common name of another species is somewhere inbetween.

--
Mats

Thats correct ...its how we got tiginus and tigrinum .... very confusing and totally unnecessary.
Naming L418 P.Titan is quite frankly ridiculous when the very similar L203 is commonly known as the Titanic. They should consider such things ....

[Borbi]

Hi,

I do agree that the description of P. titan fits nicely with what we knew as L 418.
On second look, however: what do we think of the distribution?
L 418 is known from Rio Huallaga, a southern tributary to Rio Maranon, which in turn unites with Rio Ucayali "flowing north" to form the Rio Solimoes.
Rio Napo on the other hand is a nothern tributary to Rio Solimoes quite some kilometers downriver from the unification of Rio Ucayali and Rio Maranon, with Iquitos in between.
If these two forms really represent the same species, I wonder why it took so long for this species to be acutally discovered and why it was "necessary" to go to such remote places to find it (I´m afraid the original description of this trip by H.-G. Evers is not available in English..).
Provided it was really that widespread, I would suspect it to be one of the most commonly exported and cheapest Panaque available, as it should be present right at the front doors of exporters located in Iquitos..

I know, just some circumstancial "evidence", but I´m not really convinced yet that P. titan is what we know as L 418..

Cheers, Sandor

[MatsP]

Just because a fish is spread over a large distribution doesn't necessarily make it common - or that it's easy to catch...

--
Mats

[taksan]

Is Panaque schaeferi a L203/LDA65 ??????

[MatsP]

Is Panaque schaeferi a L203/LDA65 ??????

Seems like it.

--
Mats

[taksan]

Is Panaque schaeferi a L203/LDA65 ??????

Seems like it.

--
Mats

Makes no sense to me ... it should have been called the Titan and the Gold Trim called the schaeferi ....

[Jools]

Naming L418 P.Titan is quite frankly ridiculous when the very similar L203 is commonly known as the Titanic. They should consider such things ....

Although I've gone with it for now I am not 100% that L418 = P. titan. There is a small chance that, in catelog terms, L203 is two things.

Jools

[The.Dark.One]

Hi

Could I have a pdf please?

[email protected]

Thanks
Steve