Coming attractions - New S.A. catfishes to come

[lfinley58]

Hi All.

Roberto Reis, a friend in Brazil, has recently sent me a copy of the abstracts from the 18th meeting of the Society of Brazilian Ichthyology. This document is, as has been in the past, a great preview of coming work of all sorts dealing mainly with Brazilian fishes. Below I am briefly listing some of the new species of catfishes that are awaiting description. By the time these abstracts are published the descriptions are usually in the pipeline (or at least close to being so), and consequently we can expect to see the full works over the coming months. I am mainly just noting the new catfishes to come, but will also provide some basic information as warranted. I may also make a personal comment or two and these will be presented in brackets so as to not confuse them with the provided information.
1. Three new species of Microglanis, family Pseudopimelodidae, from the Rios Araguaia-Tocantin. New species no. 1 is from the upper rio Tocantins; New species no. 2 from the middle rio Tocantins; and New species no. 3 from the upper rio Araguaia.
2. A new species of Microglanis, family Pseudopimelodidae, from the rio Javari, Amazon basin.
3. A revision of the genus Oligancistrus, family Loricariidae, with the description of three new species. The new species are from three river basins: Xingu, Tapajos, and Tocantins.
4. A new species of Hisonotus, family Loricariidae, from the rio Corumbatai.
5. A new species of Tetranematichthys, family Auchenipteridae. [The new species is noted to be represented by four specimens. Three of these are from the rio Trombetas basin and one is from the rio Negro. It will be interesting, from our point of view, to see if this latter locality will offer any difficulty in differentation from T. wallacei. A number of characters for differention between the two are noted].
6. A new species of Corydoras, family Callichthyidae, from the rio Urucu, basin of rio Solomoes. [ This new species is compared with C. arcuatus, C. gracilis and C. narcissus ].
7. A new genus and two new species of the subfamily Hypoptopomatinae, family Loricariidae. [These catfishes are from the upper rio Parana basin ].
8. A new species of Helogenes, family Cetopsidae, from the rio Purus. [It is possible that the fish labeled as H. marmoratus in the following link is the new species - http://silurus.acnatsci.org/ACSI/field/ ... ishes.html ].
9. A new species of Stenolicmus, family Trichomycteridae.
10. A new species of Peckoltia, family Loricariidae, from the rio Tapajos.
11. Two new species of Hypostomus, family Loricariidae, from the rio Negro. The two species are noted to belong to the cochliodon group of species.
12. [Another] new species of Hisonotus, family Loricariidae, from the rio Ivai, upper rio Parana basin.
13. A new species of Rineloricaria, family Loricariidae, from the upper rio Parana basin.
14. A new species of Pimelodus from the rio Corumba, upper Parana basin.
15. A revision of the genus Scorpiodoras, family Doradidae.
16. A redescription of Pimelodus altissimus and two new Pimelodus species from the Amazon basin.

There are also a couple of what to appear to be major phylogeny papers dealing with some Loricariidae.

Well, that gives you a brief view of some things to come. Keep your eyes open in this forum for updates as the various papers are formally published.

Lee

[kim m]

Uhh...a new Cory

[Jools]

Uhh...a new Cory

Hmmm, where do those mega metae come from? I am also speculating wildly that this may include the description of L134.

Jools

[Borbi]

Hi Jools,

yup, if my rumor memory doesn´t trick me, the description of L 134 as a Peckoltia was already poster-presented at a conference not too long ago.
I´m curious about the Oligancistrus, as well!

Cheers, Sandor

[lfinley58]

Hi Sandor and Jools (and all):

Regarding the mention of the description of a new Peckoltia species: In addition to the rio Tapajos, specimens were also noted to have been collected in the rio Jamanxim, a tributary of the Tapajos. A quick look around shows that this is also a noted locality of L134 (in the Wels Atlas, Band 2). I don't know if this helps or not in the thoughts on the possibility of the fish being L134, but thought I would mention it. There are also notes in the abstract on the color pattern of the new species...I will get these translated and follow up with them later today or tomorrow. Possibly this will be of some help.

Lee

[The.Dark.One]

I think my friend and I will probably have 2 of the 4 new species of Microglanis. We shall see!

[Borbi]

Hi again,

..so, there is some hope for my memory, after all. I found the source of my faint memory, Christian Cramer was at the EBI 2009 and took some pictures he reported at http://www.l-welse.com (http://www.l-welse.com/forum/showthread.php?t=22704). The very first one shows the work-in-progress of the description of L 134.

So, Lee, that seems to fit quite nicely. Some more information would be welcome, of course, too! Locations, colour differences etc. do fit quite well.
Although my personal oppinion is, that L 134 should get it´s own genus. On the other hand, I would have to revise my identification key, then..

Cheers, Sandor

[pleco_breeder]

My German wasn't all that great to start, but I didn't see anything which actually gave a species name in either the pic or the thread. Any "insider info" on what this may be after publication?

Larry

[Borbi]

Hi Larry,

..well, I´m not a professional biologist, so my knowledge of the rules is limited. But wouldn´t stating the name before already be an act of nomenclature..? In that sence, it would probably be the only way to not state the name before the publication has been properly peer-reviewed. So I´m afraid we will have to be patient..
Unless, of course, the abstract Lee has access to says different (would be interested about that as well)!
But to reassure your german: nothing related to the name is mentioned there.

Cheers, Sandor

[Jools]

Yes, it's somewhere between very poor etiquette and disruptive behaviour to propagate (in this instance, discuss online) new names before they are published.

The things been swimming in the river for a least tens of thousands of years, I think we can wait a few weeks for its name.

Jools

[pleco_breeder]

I understand the etiquette issue and honestly wasn't thinking when I made that earlier post. In this technological society, I still tend to forget that these online discussions are out there for the world to see and could cause problems if too many questions are answered.

Larry

[lfinley58]

Hi all,

Re the color pattern of the to be described Tapajos Peckoltia : The body is noted to have a pattern of irregular wide dark brown streak like markings on a light colored brown base. In a lateral view some of the markings may take the form of a "Y". One the snout are seen some longitudinal dark lines. These features are somewhat generic and might be open to some interpretation, but there is one noted feature which does fit quite nicely with L134. The authors note that the new species can be distinguised from all other Peckoltia (except for P. bachi ) by the presence of small dark spots on the rays of the fins which are not seen on the connecting interradial membranes. This type of fin pattern can be nicely seen in the pictures of L134 in the DATZ L Numbers Special and Wels Atlas, Band 2. Of course P. bachi has a totally different body pattern so there is no problem in potentially mixing up the two.

Re name: As is typical for such works no scientific name is proposed for the fish and it is only referred to as Peckoltia sp. n.

I'll come back tomorrow with some more info regarding the to be described species of Oligancistrus.

Lee

[Haavard Stoere]

This is very exiting:)
Looking at the bottom right of the second picture it seems like L25 is mentioned as Pseudacanthicus leopardus. I may be wrong on the context.

[lfinley58]

Hello all.

Back with some info on the three new

Oligancistrus

species. In the abstract there are differences noted in the numbers of teeth in each species and it is also stated that there are osteological differences between the species. The latter are not specified...and, in any case (as with the teeth numbers), would really be of no help to us here. The one area that does provide some information of potential use is a brief description of the color pattern of each species. I will make note of these below and offer up my "probably/possibly is" thoughts as it relates to L Numbers from the particular areas.
1. The Xingu species - The color pattern noted to be dark brown with large white spots. For this my guess would be

Oligancistrus sp(L020)

. But it must also be considered that

Oligancistrus sp(L354)

could be involved. But, for just a gut reason, I am tending towards the

Oligancistrus sp(L020)

.
2. The Tocantins species - The color pattern is noted to be dark brown with small yellow spots. This would seem to fit nicely with

Oligancistrus sp(L086)

.
3. The Tapajos species - The color pattern is noted to be dark brown without any spots. This nicely fits

Oligancistrus sp(L363)

from the rio Jamanxim which lies within the Tapajos basin.

Any additional thoughts and/or discussion, based on the admittedly sketchy information, would be welcomed. Basically, I guess we will have to wait for publication to be sure and see which L Numbers get retired. But it is enjoyable to flesh it over in a great forum such as this.

Lee

[Mod edit: Modify L-numbers to CLOG-links on request from Dave Rinaldo. --Mats]

[Borbi]

Hi Lee,

first, thanks for that additional information!

I certainly agree with the second and third species. A faint possibility would also be L 175, but since we don´t know how that one would look like if grown up (the "type" is a small specimen) that´s probably not very helpful. L 30 and L 417 would somewhat fit the colour pattern, but not really the distribution you quote.

What I´m really curious about is the distinction between L 20 and L 354. I completely agree that they are the most probable ones for the Xingu species. Since they are not only told apart due to colouration, but also due to differences in the dentition, I wonder whether they would be recognized as a single, variable species or whether they "should" be two different species. Probably depends a little on how "lumpy" the authors are. My suspicion is, however, that they will be subsumed under the same species, so we would be dealing with two variants of an Oligancistrus species, in the future.

I don´t expect those newly discribed species to be unknown to the hobby, as they appear to stem from heavily collected areas.

Cheers, Sandor

[Suckermouth]

Did you, by any chance, get the authors for those abstracts? I can make a few guesses but I'd like to be sure.

[michele]

Hi Lee,

I'm particularly interested in the new species of Rhineloricaria.........any pics of this one yet?

Michele Romeo!