tag:blogger.com,1999:blog-5519292617097628087.post359261820440525172..comments2024-01-02T16:09:12.886-07:00Comments on Chinleana: Postcranial Anatomy and Phylogenetic Relationships of the Sauropodomorph Mussaurus patagonicus Bill Parkerhttp://www.blogger.com/profile/05941940882532354219noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-5519292617097628087.post-35944929098714552952013-09-06T01:46:24.484-07:002013-09-06T01:46:24.484-07:00Sauropodiformes was named by Sereno on his TaxonSe...Sauropodiformes was named by Sereno on his TaxonSearch website in 2005 but first published in his 2007 Ammosaurus paper with the definition "The least inclusive clade containing Mussaurus patagonicus Bonaparte and Vince, 1979 and Saltasaurus loricatus Bonaparte and Powell, 1980". The Eodromaeus paper contains an identical definition on page 210, so does specify exactly which sauropodomorphs don't belong.<br /><br />Thanks for linking to McPhee's thesis, as I had not seen it yet. But you got his definition wrong, as he defines Sauropodiformes as (Saltasaurus <- Massospondylus), which is more inclusive than Sereno's definition. I don't think this is helpful.<br /><br />Basically, Yates, Upchurch and Sereno each had a different opinion on which near-sauropod clade to define. So now we have Massopoda for (Saltasaurus <- Plateosaurus), Anchisauria for (Anchisaurus + Saltasaurus) and Sauropodiformes for (Mussaurus + Saltasaurus).Mickey Mortimerhttps://www.blogger.com/profile/08831823442911513851noreply@blogger.comtag:blogger.com,1999:blog-5519292617097628087.post-5213531112471516762013-09-05T20:30:59.913-07:002013-09-05T20:30:59.913-07:00In the cladistic analysis of Eodromaeus, Martinez,...In the cladistic analysis of Eodromaeus, Martinez, Sereno, and colleagues use Sauropodiformes for all saurodomorphs more derived than Guaibasauridae. Although Sereno uses Mussaurus as an internal specifier for Sauropodiformes but doesn't say whether the non-anchisaurian sauropodomorphs are part of his definition of Sauropodiformes, McPhee's 2013 thesis (see http://wiredspace.wits.ac.za/bitstream/handle/10539/12967/Masters_Blair%20McPhee_final.pdf?sequence=1) defines Sauropodiformes as the most inclusive clade containing Yunnanosaurus and Saltasaurus but not Massospondylus, in which case Sauropodiformes would be used for all massopods more derived than Massospondylus or Riojasaurus. To avoid future confusion, Anchisauria should be used to accomodate Anchisaurus, Mussaurus, and Sauropoda, while Sauropodiformes should be used for the Mussaurus+Aardonyx+Sauropoda clade. Davidowhttps://www.blogger.com/profile/06099864739987549261noreply@blogger.comtag:blogger.com,1999:blog-5519292617097628087.post-88538270454286715842013-09-05T20:08:49.183-07:002013-09-05T20:08:49.183-07:00If you've looked at the cladogram in Otero and...If you've looked at the cladogram in Otero and Pol, Coloradisaurus is recovered as a massospondylid and does not form a clade with Mussaurus to the exclusion of other basal sauropodomorphs. Otero and Pol used adult characters in their cladistic analysis because the juvenile characters in the holotype of Mussaurus would give the sauropodomorph workers the false impression that Mussaurus is a very primitive sauropodomorph. Since the specimens described by Otero and Pol share characters with the Mussaurus type specimen but not Coloradisaurus, the hypothesis that Mussaurus is a juvenile of Coloradisaurus is no longer tenable.Davidowhttps://www.blogger.com/profile/06099864739987549261noreply@blogger.comtag:blogger.com,1999:blog-5519292617097628087.post-87564066601633963012013-09-05T16:15:30.357-07:002013-09-05T16:15:30.357-07:00And 36 years later, Casamiquela's Plateosaurus...And 36 years later, Casamiquela's Plateosaurus sp. remains are finally described. Excellent paper though. One consequence of this paper that the authors don't mention the significance of is that it lets us use Sereno's taxon Sauropodiformes more effectively, as it was defined as Mussaurus + Saltasaurus. Previously, Mussaurus' affinities were poorly known so that the clade could go in several different positions.Mickey Mortimerhttps://www.blogger.com/profile/08831823442911513851noreply@blogger.comtag:blogger.com,1999:blog-5519292617097628087.post-61288528998709514492013-09-05T11:08:21.494-07:002013-09-05T11:08:21.494-07:00So, Coloradisaurus is not the adult form after all...So, <i>Coloradisaurus</i> is not the adult form after all, huh?Mike Keeseyhttps://www.blogger.com/profile/00147156174467903264noreply@blogger.com