[dinosaur] Cretaceous plesiosaurs of Antarctica (free pdf)

Ben Creisler
[email protected]


 A now out in full form with free pdf (was abstract only):


Jose Patricio O’GORMAN, Rodrigo OTERO, Marcelo REGUERO & Zulma GASPARINI
(2019)
Cretaceous Antarctic plesiosaurs: stratigraphy, systematics and
paleobiogeography.
Advances in Polar Science 30(3): 210-227
doi: 10.13679/j.advps.2018.0049
https://urldefense.proofpoint.com/v2/url?u=http-3A__www.aps-2Dpolar.org_paper_2019_30_03_A190726000001&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=kgwdQjT9ITynYJC6CZU03JyZ6kBaMSROUrqkTxsa09U&s=2A2tAwe7Munm5qEi0aepnY12IVdA9DeO1o7tiHJmY80&e= 

Free pdf:
https://urldefense.proofpoint.com/v2/url?u=http-3A__www.aps-2Dpolar.org_paper_2019_30_03_A190726000001_full&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=kgwdQjT9ITynYJC6CZU03JyZ6kBaMSROUrqkTxsa09U&s=YwxAaXvatBBSguBWGnOa8nszJzJmcyA9Wqk2eTBzv2A&e= 


The last twenty million years (Maastrichtian–Santonian) of Southern
Hemisphere plesiosaur history is especially well recorded in the Weddellian
Province (Patagonia; Western Antarctica and New Zealand). The oldest Late
Cretaceous plesiosaurs, two specimens referred to Polycotylidae indet.,
come from the Santonian levels of the Santa Marta Formation, while the
oldest elasmosaurids come from the lower Campanian of the same formation.
In the lower Maastrichtian of the Snow Hill Island Formation the
non-aristonectine elasmosaurid Vegasaurus molyi is recorded together with
other non-diagnosable elasmosaurid specimens, but no aristonectines are
present. Aristonectines appears in the Antarctic record in the upper
Maastrichtian of the López de Bertodano Formation and are represented by
Morturneria and cf. Aristonectes. The specimens from the upper Campanian
previously referred to Aristonectinae indet. are referred to Elasmosauridae
indet., shortening the temporal record of Aristonectinae in Antarctica.
Therefore aristonectines appears in the Antarctic record in the upper
Maastrichtian of the López de Bertodano Formation and are represented by
Morturneria and cf. Aristonectes. The Antarctic Cretaceous elasmosaurids
show a paleobiogeographic connection with South America and New Zealand
(Weddellian Province). This connection is indicated by the shared presence
of the Aristonectinae Kaiwhekea katiki (New Zealand) and Aristonectes
(Argentina and Chile). Recent phylogenetic analysis recovered the
aristonectines within the Weddellonectia clade, which includes the
aristonectines and the non-aristonectines Vegasaurus molyi (Isla Vega,
Antarctica); Kawanectes lafquenianum (Argentina); Morenosaurus stocki and
Aphrosaurus furlongi (California). Among the Weddellonectia, the
aristonectines show a relatively large body size and extremely derived
features and probably occupied a trophic niche that differed from the
trophic niche of other elasmosaurids. By way of contrast Kawanectes
lafquenianum is an extremely small body-sized elasmosaurid restricted to
marginal marine (probably estuarine) environments. Therefore the
Weddellonectia show high morphological and probably high ecological
diversity.

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