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Kookne yeutensis gen. et sp. nov.

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Old Saturday 7th December 2019, 13:32   #1
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Kookne yeutensis gen. et sp. nov.

This paper also describes a new ornithopod, Isasicursor santacrucensis, and a new titanosaurian sauropod, Nullotitan glaciaris.

Novas, F., F. Agnolin, S. Rozadilla, A. Aranciaga-Rolando, F. Brissón-Eli, M. Motta, M. Cerroni, M. Ezcurra, A. Martinelli, J. D'Angelo, G. Álvarez-Herrera, A. Gentil, S. Bogan, N. Chimento, J. García-Marsà, G. Lo Coco, S. Miquel, F. Brito, E. Vera, V. Loinaze, M. Fernandez, and L. Salgado (2019)
Paleontological discoveries in the Chorrillo Formation (upper Campanian-lower Maastrichtian, Upper Cretaceous), Santa Cruz Province, Patagonia, Argentina
Revista del Museo Argentino de Ciencias Naturales 21: 217-293
doi: 10.22179/REVMACN.21.655

The first fossil remains of vertebrates, invertebrates, plants and palynomorphs of the Chorrillo Formation (Austral Basin), about 30km to the SW of the town of El Calafate (Province of Santa Cruz), are described. Fossils include the elasmarian (basal Iguanodontia) Isasicursor santacrucensis gen. et sp. nov., the large titanosaur Nullotitan glaciaris gen. et sp. nov., both large and small Megaraptoridae indet., and fragments of sauropod and theropod eggshells. The list of vertebrates is also composed by the Neognathae Kookne yeutensis gen. et sp. nov., two isolated caudal vertebrae of Mammalia indet., and isolated teeth of a large mosasaur. Remains of fishes, anurans, turtles, and snakes are represented by fragmentary material of low taxonomical value, with the exception of remains belonging to Calyptocephalellidae. On the other hand, a remarkable diversity of terrestrial and freshwater gastropods has been documented, as well as fossil woods and palinological assemblages. The Chorrillo Formation continues south, in the Las Chinas River valley, southern Chile, where it is called Dorotea Formation. Both units share in their lower two thirds abundant materials of titanosaurs, whose remains cease to appear in the upper third, registering only elasmarians (Chorrillo Formation) and hadrosaurs (Dorotea Formation). Above both units there are levels with remains of invertebrates and marine reptiles. It is striking that the dinosaurs of the lower two thirds of the Chorrillo and Dorotea formations are represented by large basal titanosaurs and Megaraptoridae coelurosaurs, being the Saltasaurinae and Aeolosaurinae sauropods and Abelisauridae theropods totally absent. In contrast, these taxa are dominant components in sedimentary units of central and northern Patagonia (e.g., Allen, Los Alamitos, La Colonia formations). Such differences could reflect, in part, a greater antiquity (i.e., late Campanian-early Maastrichtian) for the Chorrillo fossils, or, more probably, different environmental conditions. Thus, knowledge of the biota of the southern tip of Patagonia is expanded, particularly those temporarily close to the K-Pg boundary.
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Old Saturday 7th December 2019, 17:35   #2
Fred Ruhe
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For those interested, the complete paper can ve found here:

Fred (thanks to Albert Chen)
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Old Saturday 7th December 2019, 20:21   #3
Fred Ruhe
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Aves Linnaeus, 1758
Ornithurae Haeckel, 1866
Kookne yeutensis nov. gen. et sp.

Holotype. MPM 21550, incomplete right coracoid lacking sternal end and proximal end damaged

Etymology. “Kookne”, mythological swan companion of the Aonikenk hero Elal; and yeutensis, from “yeut”, “mountain” in Aonikenk language.

Type locality. Titanosaur tibia site (locality 2): This place provided a single, well preserved titanosaur tibia, titanosaur eggshells, sauropod teeth, theropod eggshells, avian coracoid, snake vertebra, and fish teeth. This site yielded the woods described above. Stratigraphically it corresponds to the lower third of the Chorrillo Formation.

Age. The Chorrillo Formation Upper Cretaceous, Campanian-Maastrichtian.


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