[dinosaur] Sarcosuchus hartti from Cretaceous of Brazil + Necrosuchus ionensis from Paleocene of Argentina

Ben Creisler
[email protected]


New papers:


Rafael G. Souza, Rodrigo G. Figueiredo, Sérgio A. K. Azevedo, Douglas Riff
& Alexander W. A. Kellner (2019)
Systematic revision of Sarcosuchus hartti (Crocodyliformes) from the
Recôncavo Basin (Early Cretaceous) of Bahia, north-eastern Brazil.
Zoological Journal of the Linnean Society: zlz057,
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1093_zoolinnean_zlz057&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=pxW6oUaX2Qy_hnyum_dkBy-d7PIFhbwc4So190G6IbM&s=cBohcCpYclvDXLEfUi4VMIIUup6Tnr2zuXnQ3c47GNk&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__academic.oup.com_zoolinnean_advance-2Darticle-2Dabstract_doi_10.1093_zoolinnean_zlz057_5546069&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=pxW6oUaX2Qy_hnyum_dkBy-d7PIFhbwc4So190G6IbM&s=sdZ1yUMm-3vrD3txc1zOXTiKgBTs252fuwVuBlp5fy0&e= 


Sarcosuchus hartii was a top predator that inhabited the fluvial and
coastal areas of north-eastern Brazil during the Early Cretaceous. Several
fossil remains were recovered during the late 19th and early 20th centuries
from strata that outcrop in the Recôncavo Basin in the state of Bahia. A
re-analysis of this material shows that S. hartii is a valid species. The
Brazilian taxon differs from the African Sarcosuchus imperator in the
unique pattern of anastomosing ornamentation observed on the enamel
surface. The inclusion of S. hartii in a novel phylogenetic analysis
recovered it inside Tethysuchia, a large clade comprising South and North
American pholidosaurids along Elosuchidae and Dyrosauridae. The
evolutionary origin of Sarcosuchus is likely related to a cladogenesis
event that resulted from the break-up of Gondwana.

====

Giovanne M. Cidade, Daniel Fortier & Annie S. Hsiou (2019)
Taxonomic and phylogenetic review of Necrosuchus ionensis (Alligatoroidea:
Caimaninae) and the early evolution and radiation of caimanines.
Zoological Journal of the Linnean Society: zlz051
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1093_zoolinnean_zlz051&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=pxW6oUaX2Qy_hnyum_dkBy-d7PIFhbwc4So190G6IbM&s=fmBR3clpEwxFFvKZT1os0v9KCFaM1NISBPTHpMxomRA&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__academic.oup.com_zoolinnean_advance-2Darticle-2Dabstract_doi_10.1093_zoolinnean_zlz051_5546088&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=pxW6oUaX2Qy_hnyum_dkBy-d7PIFhbwc4So190G6IbM&s=bR4RTagaeEy43kD3Tm5nylypbw2bkpg2cuUqoxlN2_0&e= 



Alligatoroidea is the most species-rich crocodylomorph clade of the
Cenozoic of South America, with nearly all species belonging to the
Caimaninae clade. However, the earliest records of Caimaninae in South
America, which are from the Palaeocene, are based mostly on incomplete
specimens, which increases the importance of detailed taxonomic and
phylogenetic studies on these taxa. This paper offers a taxonomic and
phylogenetic review of Necrosuchus ionensis, a caimanine species from the
Salamanca Formation of the Palaeocene of Argentina. Necrosuchus ionensis is
considered a valid species, albeit with a different diagnosis from that
proposed by previous authors. The phylogenetic analysis shows, for the
first time, that N. ionensis belongs to the derived Caimaninae clade
Jacarea. However, a better understanding of the Jacarea clade is needed,
and alternative placements for N. ionensis might be considered.
Nevertheless, the placement of N. ionensis as a derived caimanine raises
interesting perspectives on the early evolution and radiation of
caimanines, which are thoroughly discussed in this paper together with
other results obtained in this study, such as the recovery of the North
American caimanines Bottosaurus and Tsoabichi as a clade.


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