[dinosaur] Itapeuasaurus, new rebbachisaurid sauropod from Cretaceous of Brazil

Ben Creisler
[email protected]

A new paper:

Itapeuasaurus cajapioensis gen. et sp. nov.

Rafael Matos Lindoso, Manuel Alfredo Araújo Medeiros, Ismar de Souza
Carvalho, Agostinha Araújo Pereira, Ighor Dienes Mendes, Fabiano VidoiIori,
Eliane Pinheiro Sousa, Silvia Helena Souza Arcanjo & Taciane Costa Madeira
Silva (2019)
A new rebbachisaurid (Sauropoda: Diplodocoidea) from the middle Cretaceous
of northern Brazil.
Cretaceous Research (advance online publication)
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1016_j.cretres.2019.104191&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=jfA_SnZq3iinL7g6biBFTh_mc81NBLVIaMoohOqlDbs&s=EJ-4uPE9mSMopdkDW9w5WyIKptz3HjU099W5GEFi84c&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.sciencedirect.com_science_article_pii_S0195667118302064&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=jfA_SnZq3iinL7g6biBFTh_mc81NBLVIaMoohOqlDbs&s=_Yt2IxQXSzy2656olkDpe8KGDSW9_k0Rbo2RcIBK83w&e= 



A new genus and species of Rebbachisauridae sauropod from the Cenomanian of
the São Luís Basin, Alcântara Formation, Itapeuasaurus cajapioensis gen. et
sp. nov., is described, the first from this temporal interval in northern
Brazil. It is characterized by the presence of large and deep fossae on
ventro-lateral aspect of the dorsal neural arch split by laminae obliquely
oriented; posterior centrodiapophyseal lamina forked ventrally forming the
dorsal edge of the centrodiapophyseal fossa; dorsal and ventral components
of anterior caudal transverse process thinner than the usual bony bar. This
latter feature is associated with the presence of a prezygodiapophyseal
centrodiapophyseal fossa accessory lamina. The phylogenetic analysis
performed herein identifies the subclade Nigersaurinae as a South American
– African/European clade, suggesting a vicariant event before Cenomanian
times. In addition, continental vertebrate taxa recorded in the Alcântara
Formation offer support to a minor evolutionary change after major
vicariant event in Western Gondwana.


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