Thecodontosauridae

{{Short description|Extinct family of dinosaurs}}

{{Automatic taxobox

| name = Thecodontosaurids

| fossil_range = Late Triassic,
~{{Fossil range|206|201.3|earliest=216.5|latest=Hettangian}} Possible survival into the Early Jurassic

| image = Thecodontosaurus antiquus skeleton.png

| image_upright = 1.1

| image_caption = Skeletal restoration of Thecodontosaurus antiquus

| taxon = Thecodontosauridae

| authority = Lydekker, 1890

| type_species = {{extinct}}Thecodontosaurus antiquus

| type_species_authority = Morris, 1843

| subdivision_ranks = Genera

| subdivision =

• {{extinct}}Agrosaurus
• {{extinct}}Thecodontosaurus

}}

Thecodontosauridae is a family of basal sauropodomorph dinosaursM.J. Benton, L. Juul, G.W. Storrs and P.M. Galton, (2000), "Anatomy and systematics of the prosauropod dinosaur Thecodontosaurus antiquus from the upper Triassic of southwest England", Journal of Vertebrate Paleontology 20(1): 77-108 that are part of the Bagualosauria,{{Cite journal |doi = 10.1080/14772019.2019.1683902|title = Craniomandibular osteology of Macrocollum itaquii (Dinosauria: Sauropodomorpha) from the Late Triassic of southern Brazil|journal = Journal of Systematic Palaeontology|pages = 805–841|year = 2019|last1 = Müller|first1 = Rodrigo Temp|volume = 18|issue = 10|s2cid = 209575985}} known from fossil remains found exclusively in the Magnesian Conglomerate of Bristol, England,[https://paleobiodb.org/classic/displayStrata?geological_group=&formation=Magnesian%20Conglomerate&group_formation_member=Magnesian%20Conglomerate Magnesian Conglomerate] in the Paleobiology Database which dates back to the Rhaetian stage of the Late Triassic (although it could be as old as the Norian stage of the Late Triassic and as young as the Hettangian stage of the Early Jurassic). Two genera are known: AgrosaurusSeeley. H. G. (1891). On Agrosaurus macgillivrayi (Seeley), a saurischian reptile from the N.E. coast of Australia. Quarterly Journal of the Geological Society of London 47:164-165 and Thecodontosaurus;Riley, H., and Stutchbury, S., (1836), "[https://archive.org/details/proceedings218331838geol/page/397/mode/1up A description of various fossil remains of three distinct saurian animals discovered in the autumn of 1834, in the Magnesian Conglomerate on Durdham Down, near Bristol]", Proceedings of the Geological Society of London 2:397–399 the former is often considered to be the same animal as the latter.{{cite book |last=Weishampel |first=David B. |authorlink=David B. Weishampel |author2=Barrett, Paul M.|author3=Coria, Rodolfo A.|author4=Le Loueff, Jean|author5=Xu Xing|author6=Zhao Xijin|author7=Sahni, Ashok|author8=Gomani, Elizabeth M.P.|author9= Noto, Christopher N. |editor=Weishampel, David B. |editor2=Dodson, Peter |editor3=Osmólska, Halszka |title=The Dinosauria |edition=2nd |year= 2004|publisher=University of California Press |location=Berkeley |isbn=978-0-520-24209-8 |pages=517–606 |chapter=Dinosaur distribution }}