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Re: Pantydraco anatomy described (free pdf)

Could be the worst dinosaur name ever.


On Mar 9, 2011, at 8:51 PM, bh480@scn.org wrote:

> From: Ben Creisler
> bh480@scn.org
> This paper has been out for at least a week but has not been mentioned on
> the DML that I recall. The pdf is free at:
> http://www.ville-ge.ch/mhng/paleo/paleo-pdf/29-2/pal_29_2_04.pdf
> Galton, Peter & Kermack, Diane, 2010.
> The anatomy of Pantydraco caducus, a very basal sauropodomorph dinosaur 
> from the Rhaetian (Upper Triassic) of South Wales, UK.
> Revue de Paléobiologie 29 (2) : 341--404 (décembre 2010) 
> Abstract
> Apart from characters of the dentary (proportional shortness, also 
> Saturnalia tupiniquim) and vertebrae of proximal third of tail (posterior
> position of antero-posteriorly short neural spine on arch, absence of
> ventral furrowing on centra  ; both also Efraasia minor), the bones of very
> basal sauropodomorphs from the Rhaetian (Upper Triassic) fssure fll in
> Clifton near Bristol (including holotypes of Thecodontosaurus antiquus,
> Asylosaurus yalensis  ; taxon with robust humerus) share no diagnostic
> characters with those of Pantydraco caducus from the rhaetian of South
> Wales. this taxon is diagnosed by four autapomorphies  : median fusion of
> the nasals, prominent medial tubercle from posterior part of surangular,
> epipophyses of cervical vertebrae 3-5 form fat plates that overhang  the
> posterior margins of the postzygapophyseal facets but do not form raised
> ridges on the dorsal surface of the postzygapophysis, and the fossae,
> possibly pneumatic, prominent on the neurocentral suture of cervical
> vertebrae 6-8 and shallow on the lateral part of centrum 9. the dentary is
> deep and short, with maximum height of more than 20 % of length (also
> Saturnalia tupiniquim, Thecodontosaurus antiquus), occupying less than 40 %
> of total mandibular length (also Saturnalia tupiniquim). the ilium is tall
> with a long anterior process (also 
> Anchisaurus polyzelus) and a short postacetabular process with the
> plesiomorphic absence of a brevis shelf. other plesiomorphic characters
> include the lack of a buccal emargination on the dentary (also Saturnalia
> tupiniquim)  ; teeth all recurved in lateral view  ; neck short with
> mid-cervical centra less than three times as long as wide (also Riojasaurus
> incertus, “Gyposaurus” sinensis)  ; and humerus with a uniquely small
> tubercle medial to head and an antero-posteriorly low (also Asylosaurus
> yalensis) asymmetrical deltopectoral crest with the apex at 40 % of humeral
> length. At least three different sized individuals are preserved and the
> new skeletal reconstruction, with the posterior region scaled up to match
> the larger holotype, indicates a more bipedal animal than the more
> quadrupedal pose based on the incorrect premise that the two main blocks
> represent one individual. the specimens represent juveniles as indicated by
> the proportionally large skull with large orbits and short, high snout,
> slender postorbital bone, separation of most of bones of braincase, large
> metotic fssure and fenestra ovalis, low maxillary and dentary tooth counts,
> open neurocentral sutures of cervical vertebrae, and incomplete ossifcation
> of distal ends of  the  femur and metatarsals. The diversity of basal 
> auropodomorphs  from  the Rhaetian of Wales and England adjacent to the
> Severn Estuary is high with fve taxa (Pantydraco caducus, three from
> clifton, large basal sauropod Camelotia borealis from Somerset).
> Keywords
> Upper triassic, UK, Dinosauria, Sauropodomorpha, Pantydraco,
> Thecodontosaurus, Asylosaurus, Anatomy, taxonomy.
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