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Re: [dinosaur] Anthracosauroid Eldeceeon redescribed + Permian discosauriscid fossil sites in Czech Republic



What's the story behind using the -oideae suffix for basal tetrapods, and isn't that automatically corrected to -oidea under the ICZN?

Mickey Mortimer


From: dinosaur-l-request@mymaillists.usc.edu <dinosaur-l-request@mymaillists.usc.edu> on behalf of David Marjanovic <david.marjanovic@gmx.at>
Sent: Sunday, August 16, 2020 12:59 PM
To: dinosaur-l@usc.edu <dinosaur-l@usc.edu>
Subject: Re: [dinosaur] Anthracosauroid Eldeceeon redescribed + Permian discosauriscid fossil sites in Czech Republic
 
I'm very happy to see the *Eldeceeon* paper published; it has been longed for since 1994. What I don't understand is why the authors call *Eldeceeon* an "anthracosauroid" and put that word in the keywords. They never use the form Anthracosauroideae (sic – feminine, like in botany); that name grouped the actual anthracosaurs and the seymouriamorphs together, and such a grouping is not supported in the text or the phylogenetic analysis of this paper or any other of the last 20 years, if not 25.

The interpretation of the biomechanics is odd, too: isn't a hindlimb-assisted tail-propelled swimmer (like the later *Microbrachis*, admittedly a much smaller animal) much more likely than a cursorial land animal with nothing to run after, nothing to run from, and nothing to keep its half-cartilaginous vertebral column from sagging and getting dangerously compressed in all kinds of ways? The strangest part is where the lack of ossified carpals is suggested to be a weight-saving adaptation to terrestrial running despite not being found in _any_ terrestrial runners but being common in aquatic animals of this size.

The interpretation of *Eldeceeon* (and Anthracosauria, to which it doesn't belong) as belonging to the amniote total group is just barely supported by the phylogenetic analysis, and even then only if it is presupposed that the lissamphibians are temnospondyls, which the analysis does not test.