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Re: Earliest land tetrapods had problem swallowing
Doesn't surprise me. Most of those animals, including probably all
outside the temnospondyl + amniote clade (which they all call the
tetrapod crown-group, which it may not be), were about as terrestrial as
an eel or catfish at the most. Insert rant about Walking with
Prehistoric Beasts here.
S3-1. 1 COATES, M. I. ; Univ. of Chicago, Chicago;
> Vertebrate diversity and phylogeny across the fish-to-tetrapod
> [...] However, if the tetrapods are defined on the basis of all taxa
> more closely related to living forms than to lungfishes (or
> coelacanths), then the picture of diversity flanking the
> fish-to-tetrapod transition changes.
Of course, that clade already has a name, and has had it for... over 20
years now, I think: Tetrapodomorpha. Its sister-group, which contains
lungfishes and porolepiforms, has been called Dipnomorpha for the same time.
S3-1. 3 PIERCE, SP*; HUTCHINSON, JR; CLACK, JA; The RoyalVeterinary
> College, UK, University Museum of Zoology,Cambridge, UK;
> Historical evolution of early tetrapod movement.
> [...] New fossil footprints have challenged this idea by inferring
> early tetrapods were walking -perhaps partially supported by water -
> 20 million years before any known tetrapod body fossils.
As has been pointed out in the very recent literature, these trackmakers
don't need to have been tetrapods or even other tetrapodomorphs. In very
shallow water, lungfish walk -- I think it was Nature where the paper
and the video were published last year.
I don't know if I'm already allowed to talk about what happens when you
take a bichir (*Polypterus*, an actinopterygian) out of water.