[D] Pantydraco caducus [sG]
Describer
Galton, Yates & Kermack 2007
Time
Triassic Late Jurassic Early
Classification
Saurischia Sauropodomorpha
Diet
Herbivore
Fossilsite
Pant-y-ffynnon Quarry, Wales
Typespecies
Thecodontosaurus caducus
Info
Pantydraco caducus (Galton, Yates & Kermack 2007) > Thecodontosaurus caducus (Yates, 2003)
Galton, P.M., Yates, A.M. & Kermack, D. (2007) Pantydraco n. gen. for Thecodontosaurus caducus Yates, 2003, a basal sauropodomorph dinosaur from the Upper Triassic or Lower Jurassic of South Wales, UK. Neues Jahrbuch für Geologie und Paläontologie, abh., 243: 119-125
Abstract
Numerous isolated bones from a Rgaetian (Upper Triassic) fissure fill in Clifton, Bristol, England have been referred to the basal sauropodomorph Thecodontosaurus Riley & Stutchbury 1836 (type genus of Thecodontosaurus antiquus Riley & Stutchbury vide OWen, 1842). Thecodontosaurus caducus Yates 2003 (Rhaetian of Lower Triassic fissure fill, South Wales) is based on several articulated partial skeletons of juvenile individuals.
Thecodontosaurus antiquus is based on isolated neotype dentary that does not possess an autopomorphy or a unique combination of characters. This dentary is unusually short and deep but this character is also present in Thecodontosaurus caducus and Saturnalia tupiniquim (Upper Triassic, Brazil).
However, the characters of refered Clifton postcrania cannot be used to diagnose Thecodontosaurus because there are three humeral mprphs from Clifton. No other bones from Clifton have characters diagnostic for Thecodontosaurus caducus and the ages of the two fissure fills may be different. The gracile morph long refered to Thecodontosaurus antiquus is present in the monospecific assembalge of 1000\\\'s of isolated sauropodomorph bones from the Rhaetian fissure fill at Tytherington Quarry near Bristol. A comprehensive cladistic analysis of basal sauropodomorphs, in which Thecodontosaurus antiquus (characters mostly based on Tyterington bones) and Thecodontosaurus caducus were included as sepparate terminal taxa, failed to recover a monophyletic Thecodontosaurus in all of the most parsimonious trees. Thecodontosaurus caducus Yates, 2003 is made the type species of Pantydraco n. gen., which can be diagnotised by the autapomorphic presence of pneumatic openings on cervical vertebrae 6-8. The prominent apex of the anteroposteriorly low assymetrical deltopectoral crest is at 40% of humeral length (versus low at 25%, and high at 40% and at 50% in Clifton humeri) and the tubercle medial to the head is small (large in Clifton humeri).
Etymology
Abbreviation of Pant-y-ffynnon Quarry plus Latin, draco, a fabulous lizard-like animal
Holotype
BMNH P 24, a nearly complete but disarticulated skull, both mandibular rami, a complete series of servical vertebrae, both coracoids, proximal part of both humeri, and an incomplete right ischium (See Yates, 2003)
Refered specimens
Several partial skeletons and isoloated bones (BMNH, details in Warrener, 1983; summary in Kermack, 1984)
Type horizon and locality
A Rhaetian (Upper Triassic) or Lower Jurassic fissure fill at the old Pant-y-ffnynnon Quarry (UK National Grid Reference ST 047741) near Bonvilston (and 3 miles east of Cowbridge), South Glamorgan, South Wales.
Diagnosis
An autapomorphy is the pseudopleurocoel, the opening to the pneumatic cavity on the neurocentral suture of the sixth to eight cervical vertebrae. Humerus plesiomorphic with a small tubercle medial to head and a anteroposteriorly low assymetrical deltopectoral crest with the apex at 40% of humeral length.
Galton, Yates & Kermack 2007
Time
Triassic Late Jurassic Early
Classification
Saurischia Sauropodomorpha
Diet
Herbivore
Fossilsite
Pant-y-ffynnon Quarry, Wales
Typespecies
Thecodontosaurus caducus
Info
Pantydraco caducus (Galton, Yates & Kermack 2007) > Thecodontosaurus caducus (Yates, 2003)
Galton, P.M., Yates, A.M. & Kermack, D. (2007) Pantydraco n. gen. for Thecodontosaurus caducus Yates, 2003, a basal sauropodomorph dinosaur from the Upper Triassic or Lower Jurassic of South Wales, UK. Neues Jahrbuch für Geologie und Paläontologie, abh., 243: 119-125
Abstract
Numerous isolated bones from a Rgaetian (Upper Triassic) fissure fill in Clifton, Bristol, England have been referred to the basal sauropodomorph Thecodontosaurus Riley & Stutchbury 1836 (type genus of Thecodontosaurus antiquus Riley & Stutchbury vide OWen, 1842). Thecodontosaurus caducus Yates 2003 (Rhaetian of Lower Triassic fissure fill, South Wales) is based on several articulated partial skeletons of juvenile individuals.
Thecodontosaurus antiquus is based on isolated neotype dentary that does not possess an autopomorphy or a unique combination of characters. This dentary is unusually short and deep but this character is also present in Thecodontosaurus caducus and Saturnalia tupiniquim (Upper Triassic, Brazil).
However, the characters of refered Clifton postcrania cannot be used to diagnose Thecodontosaurus because there are three humeral mprphs from Clifton. No other bones from Clifton have characters diagnostic for Thecodontosaurus caducus and the ages of the two fissure fills may be different. The gracile morph long refered to Thecodontosaurus antiquus is present in the monospecific assembalge of 1000\\\'s of isolated sauropodomorph bones from the Rhaetian fissure fill at Tytherington Quarry near Bristol. A comprehensive cladistic analysis of basal sauropodomorphs, in which Thecodontosaurus antiquus (characters mostly based on Tyterington bones) and Thecodontosaurus caducus were included as sepparate terminal taxa, failed to recover a monophyletic Thecodontosaurus in all of the most parsimonious trees. Thecodontosaurus caducus Yates, 2003 is made the type species of Pantydraco n. gen., which can be diagnotised by the autapomorphic presence of pneumatic openings on cervical vertebrae 6-8. The prominent apex of the anteroposteriorly low assymetrical deltopectoral crest is at 40% of humeral length (versus low at 25%, and high at 40% and at 50% in Clifton humeri) and the tubercle medial to the head is small (large in Clifton humeri).
Etymology
Abbreviation of Pant-y-ffynnon Quarry plus Latin, draco, a fabulous lizard-like animal
Holotype
BMNH P 24, a nearly complete but disarticulated skull, both mandibular rami, a complete series of servical vertebrae, both coracoids, proximal part of both humeri, and an incomplete right ischium (See Yates, 2003)
Refered specimens
Several partial skeletons and isoloated bones (BMNH, details in Warrener, 1983; summary in Kermack, 1984)
Type horizon and locality
A Rhaetian (Upper Triassic) or Lower Jurassic fissure fill at the old Pant-y-ffnynnon Quarry (UK National Grid Reference ST 047741) near Bonvilston (and 3 miles east of Cowbridge), South Glamorgan, South Wales.
Diagnosis
An autapomorphy is the pseudopleurocoel, the opening to the pneumatic cavity on the neurocentral suture of the sixth to eight cervical vertebrae. Humerus plesiomorphic with a small tubercle medial to head and a anteroposteriorly low assymetrical deltopectoral crest with the apex at 40% of humeral length.