[Taxacom] Frog biogeography

[Fred Schueler]

On 4/1/2014 11:25 AM, John Grehan wrote:
> I did not see any evidence from Ken refuting a leiopelmatid clade
> encompassing NZ, W Nam and Argentina (fossil). Some on this list may find
> the biogeography of this group in relation to all other frogs of some
> interest.

* I haven't chased this further, but... "While some taxonomists have 
suggested combining the North American frogs of the genus Ascaphus in 
the Ascaphidae family with the New Zealand frogs of the genus Leiopelma 
in the Leiopelmatidae family, the current consensus is that these two 
groups constitute two separate families.[4][5][6] ...The family 
Ascaphidae, of the same suborder, shares these primitive 
characteristics, and hence the two have often been described as related, 
or even part of the same family." 
http://en.wikipedia.org/wiki/Leiopelmatidae

fred.
====================================================

>
> Heads notes that "The family is sister to all other modern frogs...With its
> western North American records, Leiopelmatidae cannot be Gondwanan. San
> Mauro et al (2005) described the leiopelmatid genera as 'merely relicts',
> but this does not explain the overall allopatry between the family,
> straddling the central Pacific basin, and all other frogs, which are absent
> from the Pacific east of Fiji...The split between the Pacific
> Leiopelmatidae and all other frogs dates back to the Paleozoic or early
> Mesozoic (San Mauro et al., 2005), before the Jurassic formation of the
> Pacific plate and the Pacific basin."
>
>
> John Grehan
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