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''Trigonosaurus'' (meaning "triangle lizard" after Triangulo Mineiro, where it was found), is a
From the 1940s to 1960s, Brazilian paleontologist
''Trigonosaurus'' on the Dinosaur Mailing List (contains full abstract of description).
{{Taxonbar, from=Q134650 Saltasauridae Dinosaur genera Maastrichtian dinosaurs Marília Formation Taxa named by Alexander Kellner Fossil taxa described in 2005 Dinosaurs of Brazil
genus
Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...
of saltasaurid dinosaur
Dinosaurs are a diverse group of reptiles of the clade Dinosauria. They first appeared during the Triassic Geological period, period, between 243 and 233.23 million years ago (mya), although the exact origin and timing of the #Evolutio ...
s from the Maastrichtian
The Maastrichtian ( ) is, in the International Commission on Stratigraphy (ICS) geologic timescale, the latest age (geology), age (uppermost stage (stratigraphy), stage) of the Late Cretaceous epoch (geology), Epoch or Upper Cretaceous series (s ...
Serra da Galga Formation
The Serra da Galga Formation is a geological formation in Minas Gerais state of southeastern Brazil. Its strata date back to the Maastrichtian, and are part of the Bauru Group. It was originally considered a member of the Marília Formation.
Di ...
of Brazil
Brazil, officially the Federative Republic of Brazil, is the largest country in South America. It is the world's List of countries and dependencies by area, fifth-largest country by area and the List of countries and dependencies by population ...
. The type species
In International_Code_of_Zoological_Nomenclature, zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the spe ...
, ''Trigonosaurus pricei'', was first described by Campos, Kellner
Kellner is a German surname literally meaning "waiter". Notable people with the surname include:
* Ádám Kellner (born 1986), Hungarian tennis player
* Alex Kellner (1924–1996), baseball pitcher
* Alexander Kellner (born 1961), Brazilian paleon ...
, Bertini, and Santucci in 2005. It was based on two specimens, both consisting mainly of vertebra
Each vertebra (: vertebrae) is an irregular bone with a complex structure composed of bone and some hyaline cartilage, that make up the vertebral column or spine, of vertebrates. The proportions of the vertebrae differ according to their spina ...
e. The two specimens were originally believed to have come from the same individual. However, one specimen was described as the holotype of '' Caieiria'' in 2022, while the holotype may have instead come from '' Baurutitan''. Before its description, it was known as the "Peirópolis titanosaur", after the place it was found.
History
From the 1940s to 1960s, Brazilian paleontologist Llewellyn Ivor Price
Llewellyn Ivor Price (October 9, 1905 – June 9, 1980) was one of the first Brazilian paleontologists. His work contributed not only to the development of Brazilian but also to global paleontology. He collected ''Staurikosaurus'' in 1936, th ...
excavated several series of titanosaur fossils in the "Caieira" locality of the Serra da Galga Formation in Minas Gerais
Minas Gerais () is one of the 27 federative units of Brazil, being the fourth largest state by area and the second largest in number of inhabitants with a population of 20,539,989 according to the 2022 Brazilian census, 2022 census. Located in ...
, Brazil. Two of these, "Series B" or MCT 1488-R and "Series C" or MCT 1490-R, were named the holotypes of two titanosaur genera in 2005: ''Trigonosaurus'' and '' Baurutitan'' respectively. The describers of ''Trigonosaurus'' also referred a series of caudal vertebrae, MCT 1719-R, as the paratype of their new genus. Further titanosaur fossils from the BR-262 site of the same locality were reported by Silva Junior and colleagues in 2022, and in light of this new evidence, reconsidered MCT 1488-R to be a specimen of ''Baurutitan'', thus synonymizing ''Trigonosaurus'' with it. They also separated the caudal vertebrae (paratype) from ''Trigonosaurus'' and described it as the holotype of a new genus and species of titanosaur, '' Caieiria allocaudata''. However, not all researchers have accepted the conclusion that ''Trigonosaurus'' is a synonym of ''Baurutitan''; John Fronimos, in 2023, did not follow the proposed synonymy due to the differencess between the first caudal vertebrae of the two taxa.
References
External links
''Trigonosaurus'' on the Dinosaur Mailing List (contains full abstract of description).
{{Taxonbar, from=Q134650 Saltasauridae Dinosaur genera Maastrichtian dinosaurs Marília Formation Taxa named by Alexander Kellner Fossil taxa described in 2005 Dinosaurs of Brazil