Cranial Osteology of Hypsognathus Fenneri, a Latest Triassic Procolophonid Reptile from the Newark Supergroup of Eastern North America
نویسندگان
چکیده
Based primarily on two previously undescribed skulls, this paper presents a detailed description of the skull and mandible of the latest Triassic procolophonid reptile Hypsognathus fenneri Gilmore, 1928. One of the new skulls, belonging to a presumed juvenile, clearly establishes for the first time the sutural pattern, which differs significantly from that in Procolophon and more basal procolophonid taxa. A number of shared derived features in the structure of the skull and mandible indicate that Hypsognathus is closely related to Leptopleuron from the Upper Triassic Lossiemouth Sandstone Formation of Scotland. Hypsognathus had a wide geographic and stratigraphic distribution in eastern North America during the latest Triassic (Norian-Rhaetian).
منابع مشابه
Time calibration of Triassic/Jurassic microfloral turnover, eastern North America Reply
Evidence from sedimentation rates and stratigraphic ranges of palynomorph species indicate that van Veen is incorrect in inferring a condensed section at the Triassic/Jurassic (TR / J ) boundary in the Newark Supergroup. Van Veen bases his argument entirely on the ranges of palynomorph species in western Europe, but correlation of the European sections is equivocal, and the range data employed ...
متن کاملA New Aquatic Eosuchian from the Newark Supergroup ( Late Triassic - Early Jurassic ) of North Carolina and Virginia Paul Eric
Tanytrachelos ahynis (n.gen., n. sp.) is a lepidosaur from the Late Triassic Dan River Group (Newark Supergroup) of North Carolina and Virginia. The new reptile has gracile proportions similar to Tanystropheus (Middle Triassic) and is referred to the family Tanystropheidae of the suborder Prolacertiformes. Unlike Tanystropheus, Tanytrachelos has relatively short cervical vertebrae bearing splin...
متن کاملThe nonmarine Triassic–Jurassic boundary in the Newark Supergroup of eastern North America
For the last three decades, the position of the Triassic–Jurassic boundary (TJB) in nonmarine strata has largely been based on its palynostratigraphic placement just below the oldest basalts of the Central Atlantic magmatic province (CAMP) in the Newark Supergroup of eastern North America. This boundary, however, is demonstrably older than the TJB as it is defined in marine strata. Thus, the pa...
متن کاملA New Aquatic Eosuchian from the Newark Supergroup ( Late Triassic - Early Jurassic ) of North Carolina and Virginia
Tanytrachelos ahynis (n.gen., n. sp.) is a lepidosaur from the Late Triassic Dan River Group (Newark Supergroup) of North Carolina and Virginia. The new reptile has gracile proportions similar to Tanystropheus (Middle Triassic) and is referred to the family Tanystropheidae of the suborder Prolacertiformes. Unlike Tanystropheus, Tanytrachelos has relatively short cervical vertebrae bearing splin...
متن کاملShort Communication the Osteology and Affinities of Anomoiodon Liliensterni, a Procolophonid Reptile from the Lower Triassic Bundsandstein of Germany
The procolophonid reptile Anomoiodon liliensterni was found in the Triassic Bundsandstein of Thuringia, Germany, from the lower layers of the Chirotherium sandstone horizon in the summer of 1937 by a local bricklayer (Huene, 1939). Anomoiodon is represented by a specimen that consists of two closely associated skeletons that are preserved as natural molds in a block of medium-grained sandstone ...
متن کامل