A new phytosaur species (Archosauriformes) from the Upper Triassic of Jameson Land, central East Greenland
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Standard
A new phytosaur species (Archosauriformes) from the Upper Triassic of Jameson Land, central East Greenland. / López-Rojas, Víctor; Clemmensen, Lars B.; Milàn, Jesper; Wings, Oliver; Klein, Nicole; Mateus, Octávio.
I: Journal of Vertebrate Paleontology, Bind 42, Nr. 3, e2181086, 2022.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - A new phytosaur species (Archosauriformes) from the Upper Triassic of Jameson Land, central East Greenland
AU - López-Rojas, Víctor
AU - Clemmensen, Lars B.
AU - Milàn, Jesper
AU - Wings, Oliver
AU - Klein, Nicole
AU - Mateus, Octávio
N1 - Publisher Copyright: © 2023, by the Society of Vertebrate Paleontology.
PY - 2022
Y1 - 2022
N2 - 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, indicating that at least this individual was close to somatic maturity. Mystriosuchus has formerly been known as an exclusively European taxon. The new findings support the European faunal influence in East Greenland during the Late Triassic inferred from other taxa such as temnospondyls and archosaurs. The mid-late Norian age of European Mystriosuchus suggests an additional age constraint for the vertebrate-bearing portion of the Malmros Klint Formation.
AB - 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, indicating that at least this individual was close to somatic maturity. Mystriosuchus has formerly been known as an exclusively European taxon. The new findings support the European faunal influence in East Greenland during the Late Triassic inferred from other taxa such as temnospondyls and archosaurs. The mid-late Norian age of European Mystriosuchus suggests an additional age constraint for the vertebrate-bearing portion of the Malmros Klint Formation.
U2 - 10.1080/02724634.2023.2181086
DO - 10.1080/02724634.2023.2181086
M3 - Journal article
AN - SCOPUS:85150951351
VL - 42
JO - Journal of Vertebrate Paleontology
JF - Journal of Vertebrate Paleontology
SN - 0272-4634
IS - 3
M1 - e2181086
ER -
ID: 342614178