Re: ancestral apistos

[swaldron@slip.net]

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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