[dinosaur] Somphospondylan sauropod bone from Cuba.

Ben Creisler
[email protected]

A new paper:

S. Apesteguía, Y. Ceballos Izquierdo & M. Iturralde-Vinent (2019)
New taxonomic assignment for a dinosaur sauropod bone from Cuba.
Historical Biology (advance online publication)
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1080_08912963.2019.1661406&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=IfdzI6h1nNP4CSv_eRr5sPKtLaxvnrf-lzBeK7dgIRc&s=FlEdLMj0LgSCmRTVnYsllpfv01_WjUGoVRSJwoeRNgk&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.tandfonline.com_doi_full_10.1080_08912963.2019.1661406&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=IfdzI6h1nNP4CSv_eRr5sPKtLaxvnrf-lzBeK7dgIRc&s=Kn3CEQcDgJu44lOay5_OitXgxDPOAOmmK1SdmLtgi9Q&e= 


The fossil-bearing Jagua Formation of western Cuba was deposited during the
early Late Jurassic (middle to late Oxfordian) in the marine corridor
developed between western Laurasia and Gondwana, providing a rich
assemblage of terrestrial to marine fossils including reptiles, fish and
invertebrates. From this formation, De la Torre y Callejas reported in 1949
an isolated dinosaur bone, now missing, originally identified as
'Diplodocus' or 'Brontosaurus' humerus. Later, this fossil was referred as
a camarasauromorph metacarpal. Within Macronaria, metacarpals became long
and robust in Titanosauriformes. The strong curvature of the Cuban
metacarpus suggests that it probably belongs to the first or second
metacarpal of a somphospondylan. The achievement of a eugraviportal
forelimb in Sauropoda was a unique event evidenced in metacarpal
morphology. The bowed first metacarpal is present only in somphospondylans,
particularly in some basal titanosaurs, and reverses in derived forms.
Somphospondylans were not recorded yet for the early Late Jurassic neither
in North nor in South America.


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