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Heterandria/pseudoxiphophorus Tuxtlaensis

Home Forums Fresh and Brackish Water Fishes Heterandria/pseudoxiphophorus Tuxtlaensis

This topic contains 12 replies, has 7 voices, and was last updated by  keith565 9 years ago.

Viewing 13 posts - 1 through 13 (of 13 total)
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  • #300283

    keith565
    Participant

    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)

    Attached files

    #314513

    keith565
    Participant

    paper 2008.
    http://wfscnet.tamu.edu/faculty/tdewitt/Mc…)%20Zootaxa.pdf

    #314514

    Matt
    Keymaster

    Ooh very nice! Is the genus name in question Keith? Here is a pic from the paper of adult male and female.


    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:

    I see why you’re worried now mate; the differences are quite pronounced.

    Gambusia aurata:

    Gambusia vittata:

    Attached files

    #314516

    keith565
    Participant

    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.

    #314517

    keith565
    Participant

    oh, i wouldn’t mind some of those gambusia.lol

    #314524

    oaken
    Participant

    Nice fish! But yeah, I’d be quite worried too

    #314525

    retro_gk
    Participant

    The fish in the OP match Heterandria bimaculata.

    #314622

    **baitman**
    Participant

    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

    #314625

    keith565
    Participant

    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

    #314680

    Cool_Citrus
    Participant

    intresting new find, pitty all the fish from mexico are bland

    #314684

    dunc
    Keymaster

    There’s a load of pretty fish endemic to Mexico :]

    #314688

    Matt
    Keymaster

    Cool Citrus; are you kidding me? /smile.gif” style=”vertical-align:middle” emoid=”:)” border=”0″ alt=”smile.gif” />

    #314690

    keith565
    Participant

    QUOTE (Cool_Citrus @ Aug 8 2009, 05:00 PM) < {POST_SNAPBACK}>
    intresting new find, pitty all the fish from mexico are bland

    Attached files

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