TY - JOUR

T1 - Cyclotosaurus naraserluki, sp. nov., a new Late Triassic cyclotosaurid (Amphibia, Temnospondyli) from the Fleming Fjord Formation of the Jameson Land Basin (East Greenland)

AU - Marzola, Marco

AU - Mateus, Octavio

AU - Shubin, Neil H.

AU - Clemmensen, Lars B.

PY - 2017

Y1 - 2017

N2 - Cyclotosaurus naraserluki, sp. nov., is a new Late Triassic capitosaurid amphibian from lacustrine deposits inthe Fleming Fjord Formation of the Jameson Land Basin in Greenland. It is based on a fairly complete and well-preservedskull associated with two vertebral intercentra. Previously reported as Cyclotosaurus cf. posthumus, C. naraserluki is uniqueamong cyclotosaurs for having the postorbitals embaying the supratemporals posteromedially. The anterior palatal vacuitypresents an autapomorphic complete subdivision by a wide medial premaxillary-vomerine bony connection. Theparasphenoid projects between the pterygoids and the exoccipitals, preventing a suture between the two, a primitivecondition shared with Rhinesuchidae, Eryosuchus, and Kupferzellia. Within Cyclotosaurus, the Greenlandic skull has adistinctive combination of circular choanae (shared with C. ebrachensis, C. posthumus, and C. robustus) and a convexposteromedial margin of the tabulars (also present in C. ebrachensis and C. intermedius). A phylogenetic analysis indicatesthat C. naraserluki is the sister taxon of the middle Norian C. mordax from southern Germany, with which it shares a pair ofpremaxillary foramina. Cyclotosaurus is one of the most successful and diverse genera of Late Triassic temnospondyls, with atleast eight species reported from middle Carnian to late Norian. Cyclotosaurus naraserluki is the largest amphibian everreported from Greenland and one of the Late Triassic vertebrates with the highest northern paleolatitude currently known.

AB - Cyclotosaurus naraserluki, sp. nov., is a new Late Triassic capitosaurid amphibian from lacustrine deposits inthe Fleming Fjord Formation of the Jameson Land Basin in Greenland. It is based on a fairly complete and well-preservedskull associated with two vertebral intercentra. Previously reported as Cyclotosaurus cf. posthumus, C. naraserluki is uniqueamong cyclotosaurs for having the postorbitals embaying the supratemporals posteromedially. The anterior palatal vacuitypresents an autapomorphic complete subdivision by a wide medial premaxillary-vomerine bony connection. Theparasphenoid projects between the pterygoids and the exoccipitals, preventing a suture between the two, a primitivecondition shared with Rhinesuchidae, Eryosuchus, and Kupferzellia. Within Cyclotosaurus, the Greenlandic skull has adistinctive combination of circular choanae (shared with C. ebrachensis, C. posthumus, and C. robustus) and a convexposteromedial margin of the tabulars (also present in C. ebrachensis and C. intermedius). A phylogenetic analysis indicatesthat C. naraserluki is the sister taxon of the middle Norian C. mordax from southern Germany, with which it shares a pair ofpremaxillary foramina. Cyclotosaurus is one of the most successful and diverse genera of Late Triassic temnospondyls, with atleast eight species reported from middle Carnian to late Norian. Cyclotosaurus naraserluki is the largest amphibian everreported from Greenland and one of the Late Triassic vertebrates with the highest northern paleolatitude currently known.

U2 - 10.1080/02724634.2017.1303501

DO - 10.1080/02724634.2017.1303501

M3 - Journal article

VL - 37

JO - Journal of Vertebrate Paleontology

JF - Journal of Vertebrate Paleontology

SN - 0272-4634

IS - 2

M1 - e1303501

ER -