Issi saaneq gen. Et sp. nov.—A new sauropodomorph dinosaur from the late triassic (norian) of jameson land, central east greenland

UIDB/04035/2020 The Late Triassic (Norian) outcrops of the Malmros Klint Formation, Jameson Land (Green-land) have yielded numerous specimens of non-sauropod sauropodomorphs. Relevant fossils were briefly reported in 1994 and were assigned to Plateosaurus trossingensis. However, continuous new findi...

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Bibliographic Details
Published in:Diversity
Main Authors: Beccari, Victor, Mateus, Octávio, Wings, Oliver, Milàn, Jesper, Clemmensen, Lars B.
Other Authors: DCT - Departamento de Ciências da Terra, GeoBioTec - Geobiociências, Geoengenharias e Geotecnologias
Format: Article in Journal/Newspaper
Language:English
Published: 2021
Subjects:
Dinosaur
Greenland
Plateosaurid
Sauropodomorph
Triassic
Ecology
Ecological Modelling
Agricultural and Biological Sciences (miscellaneous)
Nature and Landscape Conservation
Jameson Land
East Greenland
Online Access:http://hdl.handle.net/10362/128951
https://doi.org/10.3390/d13110561
Description
Summary:UIDB/04035/2020 The Late Triassic (Norian) outcrops of the Malmros Klint Formation, Jameson Land (Green-land) have yielded numerous specimens of non-sauropod sauropodomorphs. Relevant fossils were briefly reported in 1994 and were assigned to Plateosaurus trossingensis. However, continuous new findings of early non-sauropod sauropodomorphs around the globe facilitate comparisons and allow us to now revise this material. Here, the non-sauropod sauropodomorph Issi saaneq gen. et sp. nov. is described based on two almost complete and articulated skulls. The two skulls represent a middle-stage juvenile and a late-stage juvenile or subadult. Issi saaneq differs from all other sauropodomorphs by several unique traits: (1) a small foramen at the medial surface of the premaxilla; (2) an anteropos-teriorly elongated dorsoposterior process of the squamosal; (3) a relatively high quadrate relative to rostrum height; (4) a well-developed posterodorsal process of the articular. These features cannot be explained by taphonomy, ontogeny, or intraspecific variation. Issi saaneq shows affinities to Brazilian plateosaurids and the European Plateosaurus, being recovered as the sister clade of the latter in our phylogenetic analysis. It is the northernmost record of a Late Triassic sauropodomorph, and a new dinosaur species erected for Greenland. Issi saaneq broadens our knowledge about the evolution of plateosaurid sauropodomorphs. publishersversion published

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