Its fossil has been collected from the Cloverly Formation (Aptian-Albian) of central Montana, USA, during 1996, 1997 and 1998, in the region of the Middle Dome in Wheatland County. The type species is T. cooneyorum, described by William L. Parsons and Kirsten Parsons in 2009. The genus name is derived from Oglalatatanka, "bison" and Greek kephale, "head", in reference to the rounded head form. The specific name honours the family of John Patrick Cooney. The holotype is MOR 1073, a partial skull with an estimated total undamaged length of 32 centimetres, lacking the lower jaws. Also some ribs, osteoderms and a tooth have been recovered. The front of the snout is missing. The specimen is that of an adult individual.[2]
According to the authors the fossil has not been deformed by compression, allowing to distinguish it from Sauropelta edwardsorum, another akylosaurian found in the same formation. The head is domed and the eye-sockets are round. A large bone ridge runs transversely across the back of the head. The fossil skull itself no longer had any teeth in it but a single tooth was found, lacking the cingulum. Two osteoderms were found; one was intact. It has a length of 137 and a width of 115 millimetres. It is hollow and conical.[2]
A cladistic analysis found that Tatankacephalus was a basal member of the Ankylosauridae and relatively closely related to Gastonia. Basal traits include the retention of premaxillary teeth in the front of the upper jaws and a skull opening, the lateral temporal fenestra, that was not covered by the skull armour.[2] A new cladistic analysis performed by Thompson et al., 2011 suggests that Tatankacephalus is a basalnodosaurid.[3]
^Holtz Jr., Thomas R. (2012). "Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages" (PDF).
^ abcParsons, William L.; Parsons, Kristen M. (2009). "A new ankylosaur (Dinosauria: Ankylosauria) from the Lower Cretaceous Cloverly Formation of central Montana". Canadian Journal of Earth Sciences. 46 (10): 721–738. Bibcode:2009CaJES..46..721S. doi:10.1139/E09-045.
^Richard S. Thompson; Jolyon C. Parish; Susannah C. R. Maidment & Paul M. Barrett (2012). "Phylogeny of the ankylosaurian dinosaurs (Ornithischia: Thyreophora)". Journal of Systematic Palaeontology. 10 (2): 301–312. doi:10.1080/14772019.2011.569091. S2CID 86002282.
April 09, 2024
tatankacephalus, basal, genus, nodosaurid, dinosaur, that, lived, during, early, cretaceous, length, been, estimated, meters, temporal, range, early, cretaceous, preꞒ, scientific, classificationdomain, eukaryotakingdom, animaliaphylum, chordataclade, dinosauri. Tatankacephalus is a basal genus of nodosaurid dinosaur that lived during the Early Cretaceous Its length has been estimated at 7 meters 23 ft 1 TatankacephalusTemporal range Early Cretaceous 108 5 Ma PreꞒ Ꞓ O S D C P T J K Pg N Scientific classificationDomain EukaryotaKingdom AnimaliaPhylum ChordataClade DinosauriaClade OrnithischiaClade ThyreophoraClade AnkylosauriaFamily NodosauridaeSubfamily NodosaurinaeGenus TatankacephalusParsons amp Parsons 2009Species T cooneyorumBinomial name Tatankacephalus cooneyorumParsons amp Parsons 2009Its fossil has been collected from the Cloverly Formation Aptian Albian of central Montana USA during 1996 1997 and 1998 in the region of the Middle Dome in Wheatland County The type species is T cooneyorum described by William L Parsons and Kirsten Parsons in 2009 The genus name is derived from Oglala tatanka bison and Greek kephale head in reference to the rounded head form The specific name honours the family of John Patrick Cooney The holotype is MOR 1073 a partial skull with an estimated total undamaged length of 32 centimetres lacking the lower jaws Also some ribs osteoderms and a tooth have been recovered The front of the snout is missing The specimen is that of an adult individual 2 According to the authors the fossil has not been deformed by compression allowing to distinguish it from Sauropelta edwardsorum another akylosaurian found in the same formation The head is domed and the eye sockets are round A large bone ridge runs transversely across the back of the head The fossil skull itself no longer had any teeth in it but a single tooth was found lacking the cingulum Two osteoderms were found one was intact It has a length of 137 and a width of 115 millimetres It is hollow and conical 2 A cladistic analysis found that Tatankacephalus was a basal member of the Ankylosauridae and relatively closely related to Gastonia Basal traits include the retention of premaxillary teeth in the front of the upper jaws and a skull opening the lateral temporal fenestra that was not covered by the skull armour 2 A new cladistic analysis performed by Thompson et al 2011 suggests that Tatankacephalus is a basal nodosaurid 3 See also edit nbsp Dinosaurs portalTimeline of ankylosaur researchReferences edit Holtz Jr Thomas R 2012 Dinosaurs The Most Complete Up to Date Encyclopedia for Dinosaur Lovers of All Ages PDF a b c Parsons William L Parsons Kristen M 2009 A new ankylosaur Dinosauria Ankylosauria from the Lower Cretaceous Cloverly Formation of central Montana Canadian Journal of Earth Sciences 46 10 721 738 Bibcode 2009CaJES 46 721S doi 10 1139 E09 045 Richard S Thompson Jolyon C Parish Susannah C R Maidment amp Paul M Barrett 2012 Phylogeny of the ankylosaurian dinosaurs Ornithischia Thyreophora Journal of Systematic Palaeontology 10 2 301 312 doi 10 1080 14772019 2011 569091 S2CID 86002282 Retrieved from https en wikipedia org w index php title Tatankacephalus amp oldid 1109964246, wikipedia, wiki, book, books, library,
