[dinosaur] Aenigmaspina, new crurotarsan archosaur from Late Triassic of Wales

Ben Creisler
[email protected]

A new paper:

Aenigmaspina pantyffynnonensis gen. et. sp. nov.

Erin L. Patrick, David I. Whiteside & Michael J. Benton (2019)
A new crurotarsan archosaur from the Late Triassic of South Wales.
Journal of Vertebrate Paleontology  Article: e1645147
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1080_02724634.2019.1645147&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=nakQRyUJzjATDONki3_E0iSrUM5Ar9EB46DtE4UqmWI&s=snVqNYcGCFRdTsbR800i63VIeOq7Zz7KIyUnsHTy9Ho&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.tandfonline.com_doi_full_10.1080_02724634.2019.1645147&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=nakQRyUJzjATDONki3_E0iSrUM5Ar9EB46DtE4UqmWI&s=XYNpe5LOtVDKo8YAy6pby8KCf_J0jNGDfACIpqWksqo&e= 

NOTE: This paper will likely be posted for free on Michael Benton's website
at some point.
https://urldefense.proofpoint.com/v2/url?u=https-3A__benton.blogs.bristol.ac.uk_publications_&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=nakQRyUJzjATDONki3_E0iSrUM5Ar9EB46DtE4UqmWI&s=pJ_FZfvjj-hSbONSbkJcBYYyqLcF25tE3TXSPJBHQ18&e= 




We report a third archosaur from the Late Triassic cavity-fill sediments of
Pant-y-ffynnon Quarry in South Wales, in addition to the basal
crocodylomorph Terrestrisuchus and the basal sauropodomorph dinosaur
Pantydraco. The new taxon, Aenigmaspina pantyffynnonensis, previously
referred to informally as 'Edgar,' was recovered in 1952 and is preserved
as a tight cluster of vertebrae, ribs, and a scapula in a single block, as
well as numerous associated, but now isolated, elements, including skull
bones, vertebrae, further putative elements of the forelimb, and a partial
pelvis. We present a digital model based on computed tomography (CT) scans
of the main associated blocks, which shows exquisite detail of an
associated series of 12 cervical and anterior dorsal vertebrae, with ribs
and a scapula. The well-developed spine tables and eight matching
osteoderms confirm that this is a crurotarsan archosaur, but it lacks
apomorphies of all major crurotarsan clades. Phylogenetic analysis gives
equivocal results, showing weak relationships with Proterochampsidae and
Ornithosuchidae; the new taxon might lie close to Erpetosuchidae, based on
the 'Y'-shaped spine tables.

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