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Iguanodectes geisleri/adujai?

Home Forums Fresh and Brackish Water Fishes Iguanodectes geisleri/adujai?

This topic contains 0 replies, has 1 voice, and was last updated by  coelacanth 3 years, 8 months ago.

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  • #302983

    coelacanth
    Participant

    At the recent Aqua Telford trade show, we spotted some Iguanodectes on display, ten years ago (which is when I last saw this form) I’d have just called them geisleri, but since then I’ve seen them referred to as adujai.

    We blagged four fish (which have turned out to be two pairs I think), dropping in to Pier Aquatics on the way home I spotted a tankful of the same fish (in extremely good condition as well).

    Anyone know which is which? Alternatively, has anyone got access to the original descriptions?

    Looking online offers no help, the two names appear to be used for fish that look the same to me, and either name used for fish where the relative positions of the red and black stripe varies, and also where the caudal pigmentation differs in location and extent.

    #352001

    Matt
    Keymaster

    Mmm, no luck on the papers but I’ve sent a request.

    Is this the fish?

    Iguanodectes-geisleri-rio-Aripuana-middle-Madeira-basin.jpg

    #352004

    coelacanth
    Participant

    That’s the robust form with separation between the stripes and pigment in the upper lobe of the caudal, the ones we are seeing are much more slender with a more central spot on the peduncle and caudal, others have the lower lobe pigmented (I’ll be honest here, I haven’t actually looked at good pictures to count the meristics, not had the time). Given the variation in fish like Moenkhausia collettii and M. lepidura across the range, it shouldn’t be surprising that there’s potential for varying body proportions in other species. 

    #352492

    Matt
    Keymaster

    I’ve been adding profiles for these two species today and as far as I can gather from a combination of papers and the Géry book I. geisleri can be told apart from I. adujai as follows: presence (vs. absence in I. adujai) of a black lateral stripe beneath the red stripe on the body, anal-fin origin posterior to (vs. beneath) the dorsal-fin, dorsal-fin origin at (vs. posterior to) midbody, and possession of 20-25 (vs. 28-34) anal-fin rays.

    Based on these differences the fish I posted above should be I. geisleri and the one available in the UK recently I. adujai (pic below from Neil Woodward).

    Did you get any Pete?

    Iguanodectes-geisleri-NW.jpg

    #352958

    coelacanth
    Participant

    Yeah, we’ve got a small group (forgot to reply!).

    In the latest Glaser newsletter there are three similar species stated as available, and if they have them right it does seem that the ones currently in the UK are adujai.

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