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Heterandria/pseudoxiphophorus Tuxtlaensis
July 20, 2009
6:39 pm
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keith565
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i picked up a small group of these on sunday at solway open show.
not seen or heard of them before. there was some great info with them taken from the Livebearer news 23.
a quick run down of them. if anyone knows more about them i'd be interested. they are about 40mm at the mo and not showing any sexual diversity which is worrying as max size for males is stated as 49mm.

the geometric morphometric analysis showed that H tuxtlaensis has a short and more posterior dorsal fin and narrower peduncle of relative H bimaculata. H tuxtlaensis has a small head, short dorsal fin anda short dorsal surfae relative to H Bimaculata which has a large head andd an arched dorsal surface and a long dorsal fin.

H Tuxtlaensis is a moderate sized heterandria (up to 49mm sl for males and 75mm sl for females). it is relativelt slender, with a short dorsal fin, shallow caudal peduncle and a short audal fin. in females the head is relatively narrow and the anal fin is relatively short.

etymology:- Named for the type and only known locality of the species the Tuxtla Mountains of veracruz, Mexico.

Disribution:-is endemic to catemaco and tributaries of the lake and Rio Grande de Catemaco above the falls of El Salto de Eyipantia.

remarks:- H Tuxtlaensis constitutes the 6th endemic species of the 12 indigenous fishes of lake Catemaco. future research might reveal that the remaining species are endemic to the lake.
five of the fishes in lake Catemaco are poeciliids, the other endemic species is a characid, Bramocharax caballeroi. possible other new species include a clupeid, Dorosoma, two pimelodids of the genus Rhamdia and a cichlid similar to Vija fenestrate. the level of endemicity compliments finding that the lake is ancient and well seperated from surrounding fish populations
(livebearer news, 23, pg 14/15)

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July 20, 2009
8:37 pm
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keith565
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July 20, 2009
8:43 pm
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Matt
Málaga, Spain
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Ooh very nice! Is the genus name in question Keith? Here is a pic from the paper of adult male and female.

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Ref: McEachran, J.D. and T.J. Dewitt 2008 A New livebearing fish, Heterandria tuxtlaensis, from Lake Catemaco, Veracruz, Mexico (Cyprinodontiformes: Poeciliidae). Zootaxa 1824:45-54

...and from Fishbase:

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I see why you're worried now mate; the differences are quite pronounced. /unsure.gif" style="vertical-align:middle" emoid=":unsure:" border="0" alt="unsure.gif" /> Also found a few pics of the lake and some of the other fish from the area:

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Gambusia aurata:

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Gambusia vittata:

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Cake or death?
July 20, 2009
9:14 pm
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keith565
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thanks Matt, hmm, i wonder if mine are still a bit young, but i am a bit worried, however,i'm sure i can get in touch with the breeder if need be. those fish look a lot bigger than mine, perhaps mine stiill need to grow out more to sex.
i'm not 100%sure why the name was listed as such, they seem to be under the name heterandria rather than pseudoxiphophorus, but i know as i'm sure most folk do, names are changed like the weather.lol, also they do look like the bimaculatus i've seen in the past under the pseudoxiphophorus name.
still a fab looking fish.
thanks for the info mate, much appreciated.

July 20, 2009
9:20 pm
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keith565
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oh, i wouldn't mind some of those gambusia.lol

July 22, 2009
7:43 am
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oaken
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Nice fish! But yeah, I'd be quite worried too /unsure.gif" style="vertical-align:middle" emoid=":unsure:" border="0" alt="unsure.gif" />

July 22, 2009
7:54 am
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retro_gk
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The fish in the OP match Heterandria bimaculata.

August 3, 2009
8:14 pm
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**baitman**
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QUOTE (retro_gk @ Jul 22 2009, 08:37 AM) < {POST_SNAPBACK}>
The fish in the OP match Heterandria bimaculata.

also got a look of brachraphis sp not sure of spelling

August 4, 2009
9:07 pm
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keith565
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QUOTE (retro_gk @ Jul 22 2009, 08:37 AM) < {POST_SNAPBACK}>
The fish in the OP match Heterandria bimaculata.


i've got to agree with you there. will see how they change as they get bigger, but certainly have a look of bimacs /blink.gif" style="vertical-align:middle" emoid=":blink:" border="0" alt="blink.gif" />

August 8, 2009
4:17 pm
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Cool_Citrus
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intresting new find, pitty all the fish from mexico are bland /sad.gif" style="vertical-align:middle" emoid=":(" border="0" alt="sad.gif" /> why cant we have a german ram or atleast a pseudoepiplatys annulatus or any really nice colourfull fish endemic to mexico, anyhow i actually went to that lake when i was small maybe 5 years old but i dont remember.

August 8, 2009
7:14 pm
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dunc
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There's a load of pretty fish endemic to Mexico :]

August 9, 2009
12:28 am
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Matt
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Cool Citrus; are you kidding me? /ohmy.gif" style="vertical-align:middle" emoid=":o" border="0" alt="ohmy.gif" /> Mexico is an amazing country in terms of not only native but endemic freshwater fish and very diverse to boot. I'm currently keeping Cualac tesselatus and the males are just stunning; would love to live in your country and be able to collect the native species. /smile.gif" style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" />

Cake or death?
August 9, 2009
7:58 am
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keith565
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QUOTE (Cool_Citrus @ Aug 8 2009, 05:00 PM) < {POST_SNAPBACK}>
intresting new find, pitty all the fish from mexico are bland /sad.gif" style="vertical-align:middle" emoid=":(" border="0" alt="sad.gif" /> why cant we have a german ram or atleast a pseudoepiplatys annulatus or any really nice colourfull fish endemic to mexico, anyhow i actually went to that lake when i was small maybe 5 years old but i dont remember.


got to totally disagree with you there. as the other guys have said, so many fantastic looking fish in mexico, i don't know where to start, but look at the xiphs to start with and the goodeids, and so on.

maps of some of the xiphophorus in mexico from the xiphophorus.org site

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