{{Short description|Extinct genus of dinosaurs}} {{Speciesbox | fossil_range = Late Cretaceous, {{fossilrange|Maastrichtian}} | genus = Taveirosaurus | parent_authority = Antunes & Sigogneau-Russell, 1991 | species = costai | authority = Antunes & Sigogneau-Russell, 1991 }}
'''''Taveirosaurus''''' (meaning "Taveiro lizard") is a genus of possibly eutriconodontan mammal from the Late Cretaceous Argilas de Aveiro Formation of Portugal, and also Laño, Spain. The genus is based solely on teeth, and the type species is '''''T. costai'''''.<ref name=":0" />
== Discovery and naming == In 1968, Miguel Telles Antunes and Giuseppe Manuppella uncovered fossils at the ''Cerâmica do Mondego'' quarry near Taveiro, a village in Portugal, southwest of Coimbra. Among them were a number of low triangular teeth of a herbivorous dinosaur. In 1991 these were named and described by Telles Antunes and Denise Sigogneau-Russell as the type species, ''Taveirosaurus costai''. The generic name refers to Taveiro. The specific name honours the Portuguese geologist João Carrington da Costa.<ref name=":0">M. Telles Antunes & D. Sigogneau-Russell, (1991), "Nouvelles données sur les dinosaures du Crétacé supérieur du Portugal, ''Comptes Rendus de l'Académie des Sciences à Paris'', Série II '''313''': 113-119</ref>
The holotype, '''CEGUNL-TV 10''', was found in ancient river clay of the Argilas de Aveiro Formation dating from the Maastrichtian. It consists of one tooth. Nine other teeth were also assigned to the genus, CEGUNL-TV 6–9, 11 and 13–16. Later, more teeth found near Laño in Spain were referred to ''Taveirosaurus''.<ref name="NWW04" />
== Classification == Having only the teeth to base themselves on, Telles Antunes and Sigogneau originally thought that ''Taveirosaurus'' belonged to some pachycephalosaurian group. In 1991 they assigned it to the Homalocephalidae, in 1992 to the Pachycephalosauridae.<ref>M. Telles Antunes & D. Sigogneau, (1992), "La faune des petits dinosaures du Crétacé terminal portugais", ''Comunicações dos Serviços Geológicos de Portugal'' '''78'''(1): 49-62</ref> However, they soon rejected this possibility, and ''Taveirosaurus'' has not been included in this group in recent reviews.<ref name="NWW04">{{cite book |last=Norman |first=David B. |author-link=David B. Norman |author2=Witmer, Larry M. |author3= Weishampel, David B. |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=325–334 |chapter=Basal Ornithischia}}</ref><ref name="MCW04">{{cite book |last=Maryańska |first=Teresa |author-link1 = Teresa Maryańska|author2=Chapman, Ralph E. |author3= Weishampel, David B. |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 |chapter=Pachycephalosauria |pages=464–477}}</ref><ref name="RMS06">{{cite journal| last =Sullivan| first =Robert M.| title =A taxonomic review of the Pachycephalosauridae (Dinosauria:Ornithischia) | journal =Late Cretaceous Vertebrates from the Western Interior. New Mexico Museum of Natural History and Science Bulletin| volume =35| pages =347–366| year =2006| url =http://www.robertmsullivanphd.com/uploads/130_Sullivan__2006__-Pachycephalosauridae.pdf| access-date =2010-11-10}}</ref> In 1995, it was considered to be a member of the Nodosauridae.<ref>M. Telles Antunes & D. Sigogneau-Russell, (1995), "O Cretácico terminal português e o seu contributo para o esclarecimento da extinção dos dinossauros", ''Mem. Acad. Ciênc. Lisb.'' '''35'''(1995): 131–144</ref> In 1996 Peter Galton suggested it might have belonged to the Fabrosauridae, pointing out a similarity to the teeth of ''Alocodon'' and ''Trimucrodon'', two other "tooth genera".<ref>P.M. Galton. (1996). "Notes on Dinosauria from the Upper Cretaceous of Portugal". ''Neues Jahrbuch für Geologie und Paläontologie'' Monatshefte '''1996'''(2): 83-90</ref> In 2004 David B. Norman concluded it was a ''nomen dubium'' and was unable to identify ''Taveirosaurus'' further than Ornithischia.<ref name="NWW04" /> A revision of early-diverging ornithischian phylogeny found that instead of ornithischians, the teeth of ''Taveirosaurus'' show the most similarities with members of the early mammal group Eutriconodonta, lacking characteristics of ornithischian teeth while showing a straight cingulum and linear cusps found within eutriconodontans of similar Cretaceous age.<ref name="fonseca2024">{{cite journal|last=Fonseca|first=A.O.|last2=Reid|first2=I.J.|last3=Venner|first3=A.|last4=Duncan|first4=R.J.|last5=Garcia|first5=M.S.|last6=Müller|first6=R.T.|year=2024|title=A comprehensive phylogenetic analysis on early ornithischian evolution|journal=Journal of Systematic Palaeontology|volume=22|issue=1|article-number=2346577|doi=10.1080/14772019.2024.2346577}}</ref>
==References== {{Reflist}}
== External links == * [https://web.archive.org/web/20060315213448/http://www.dinosauria.com/dml/names/dinot.htm Dinosauria Translation and Pronunciation Guide]
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Category:Maastrichtian life Category:Cretaceous Portugal Category:Fossils of Portugal Category:Fossil taxa described in 1991 Category:Nomina dubia