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Re: ancestral apistos
Steven,
There are at least 2 lineages of apistos that have invaded Guianan coastal streams.
After a long discussion with Koslowski, I tend to agree that the steindachneri-group
species probably invaded the region first. This species-group probably arose
somewhere along the northern flanks of the Brazilian Highlands in southern Brazil.
There still is an unusual apisto related to this species-group that lives there (A.
sp. Rio Preto do Candeias). There are 2 paths of entry - up the Rio Negro and around
the mouth of the Amazon. You take your pick. Ingo & I don't seem to agree on this
part. The regani-complex species obviously originated in the middle Amazon. The
species-group migrated down (as well as up) the Amazon and shows a continuous
distribution from Amapá state (Brazil), into French Guiana, Surinam, Guyana, and
eventually into eastern Venezuela.
Mike Wise
swaldron@slip.net wrote:
> Thanks for your thoughts Mike- I look forward to reading your work. Where
> do you think the apistos of the Guyana shield fit in?
>
> >Steven,
> >
> >Kullander recently wrote a paper on South American cichlid phylogeny. He
> >believes
> >that the genus Apistogramma and Gymnogeophagus are most closely related because
> >they show more plesiomorphs (ancestral characteristics) in common with
> >each other
> >than any other presently known genera. My feeling is that Apistogramma
> >originated
> >in the Mato Grosso region or along the northern slopes of the southern
> >Brazilian
> >Highlands, in southeastern Brazil. When they split from their ancestral forms
> >(something that probably looked like Geophagus brasiliensis) is anyone's
> >guess. I
> >imagine it occurred relatively recently (geologically), sometime in the late
> >Pliocene or early Pleistocene Epoch (3-2 million years ago). I have sent a
> >paper
> >to the ACA for publication titled "A Suggested Phylogeny for Apistogramma
> >Species-Groups". It should be published sometime early next year. I'm not
> >entirely happy with it. There are just too many holes in our data that can't be
> >filled in. And since I wrote it, new discoveries have shown that some changes
> >need to be made to it already.
> >
> >Mike Wise
> >
> >swaldron@slip.net wrote:
> >
> >> Mike and all,
> >> Where do we think the diverse Apisto fauna got its start? How old do we
> >> think the lineage is? What are the most ancestral forms? Is there a good
> >> phylogeny worked out?
> >>
> >> Steven J. Waldron
> >>
> >> http://WWW.ANURA.ORG
> >> "Natural History, Captive Husbandry, Conservation and
> >> Biophilia of Tropical Frogs"
> >>
> >>
> >>
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> >
> >
> >
> >
> >
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>
> Steven J. Waldron
>
> http://WWW.ANURA.ORG
> "Natural History, Captive Husbandry, Conservation and
> Biophilia of Tropical Frogs"
>
>
>
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