A new phytosaur species (Archosauriformes) from the Upper Triassic of Jameson Land, central East Greenland ...

• Main Authors: López-Rojas, Víctor, Clemmensen, Lars B., Milàn, Jesper, Wings, Oliver, Klein, Nicole, Mateus, Octávio
• Format: Dataset
• Language: unknown
• Published: Taylor & Francis 2023
• Subjects: Medicine; Physiology; FOS Biological sciences; Evolutionary Biology; 59999 Environmental Sciences not elsewhere classified; FOS Earth and related environmental sciences; Ecology; Sociology; FOS Sociology; 69999 Biological Sciences not elsewhere classified; Developmental Biology; Fleming Fjord; Greenland; Jameson Land; East Greenland
• Online Access: https://dx.doi.org/10.6084/m9.figshare.22331785; https://tandf.figshare.com/articles/dataset/A_new_phytosaur_species_Archosauriformes_from_the_Upper_Triassic_of_Jameson_Land_central_East_Greenland/22331785

Herein we describe phytosaurs from thin fluvial overbank sandstones of the Upper Triassic Malmros Klint Formation of the Fleming Fjord Group (central East Greenland). The new sample includes more than 150 disarticulated bones and teeth from small to large specimens belonging to at least four individuals. The fossils mostly consist of teeth and postcranial elements and permit the recognition of a new species of Mystriosuchus , M . alleroq , diagnosed by an L-shaped quadratojugal whose anterior suture trends anterodorsally and a tripartite degree of heterodonty. Humeral diaphyseal histology of one specimen reveals a fairly compact cortex that surrounds a cancellous medullary region followed by a remodeling zone containing scattered secondary osteons. Primary bone tissue is parallel-fibred with a moderate to low vascular density. The cortex is cyclically interrupted by distinct growth marks indicating a seasonal environment. A change in growth rate from moderate to low is documented within the outer cortex, ...