Riograndia
Encyclopedia
Riograndia is a genus
of tritheledontid cynodont
from the Late Triassic
of South America
. The type species
is R. guaibensis. Riograndia guaibensis was estimated to have been about 15 cm long and 30 g in weight. Remains have been found in the Caturrita Formation
of the geopark
of Paleorrota
. It was a small non-mammalian cynodont
several advanced features also present in mammals. Several specimens of Riograndia guaibensis have been found in the towns of Candelária
and Faxinal do Soturno
in the Caturrita Formation
.
Genus
In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...
of tritheledontid cynodont
Cynodont
Cynodontia or cynodonts are a taxon of therapsids which first appeared in the Late Permian and were eventually distributed throughout all seven continents by the Early Triassic . This clade includes modern mammals and their extinct close relatives. They were one of the most diverse groups of...
from the Late Triassic
Late Triassic
The Late Triassic is in the geologic timescale the third and final of three epochs of the Triassic period. The corresponding series is known as the Upper Triassic. In the past it was sometimes called the Keuper, after a German lithostratigraphic group that has a roughly corresponding age...
of South America
South America
South America is a continent situated in the Western Hemisphere, mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere. The continent is also considered a subcontinent of the Americas. It is bordered on the west by the Pacific Ocean and on the north and east...
. The type species
Type species
In biological nomenclature, a type species is both a concept and a practical system which is used in the classification and nomenclature of animals and plants. The value of a "type species" lies in the fact that it makes clear what is meant by a particular genus name. A type species is the species...
is R. guaibensis. Riograndia guaibensis was estimated to have been about 15 cm long and 30 g in weight. Remains have been found in the Caturrita Formation
Caturrita Formation
The Caturrita Formation is a rock formation found in Rio Grande do Sul, Brazil. Its sediments were deposited in the Paraná Basin. The formation has a late Carnian to early Norian age and forms part of the Santa Maria Supersequence in the upper section of the Rosário do Sul Group.-Etymology:The...
of the geopark
Geopark
A Geopark is defined by the United Nations Educational, Scientific and Cultural Organization in its UNESCO Geoparks International Network of Geoparks programme as follows:...
of Paleorrota
Paleorrota
Paleorrota , is a geopark located in the center of the Brazilian state of Rio Grande do Sul. The rocks and fossils found along the route date back to the times when there was only one supercontinent Pangaea....
. It was a small non-mammalian cynodont
Cynodont
Cynodontia or cynodonts are a taxon of therapsids which first appeared in the Late Permian and were eventually distributed throughout all seven continents by the Early Triassic . This clade includes modern mammals and their extinct close relatives. They were one of the most diverse groups of...
several advanced features also present in mammals. Several specimens of Riograndia guaibensis have been found in the towns of Candelária
Candelária, Rio Grande do Sul
- Paleontology :This city belongs to the geopark of Paleorrota.Museum of the city that have fossils:#Museum Aristides Carlos Rodrigues.-Day of Paleorrota:...
and Faxinal do Soturno
Faxinal do Soturno
-See also:*List of municipalities in Rio Grande do Sul...
in the Caturrita Formation
Caturrita Formation
The Caturrita Formation is a rock formation found in Rio Grande do Sul, Brazil. Its sediments were deposited in the Paraná Basin. The formation has a late Carnian to early Norian age and forms part of the Santa Maria Supersequence in the upper section of the Rosário do Sul Group.-Etymology:The...
.
See also
- PaleorrotaPaleorrotaPaleorrota , is a geopark located in the center of the Brazilian state of Rio Grande do Sul. The rocks and fossils found along the route date back to the times when there was only one supercontinent Pangaea....
- BrasilodonBrasilodonBrasilodon was a genus of cynodont that lived during the Late Triassic. Its length was approximately 12 cm and it weighed 20 grams. It fed on insects, making it an insectivore...
- Evolution of mammalsEvolution of mammals__FORCETOC__The evolution of mammals within the synapsid lineage was a gradual process that took approximately 70 million years, beginning in the mid-Permian. By the mid-Triassic, there were many species that looked like mammals, and the first true mammals appeared in the early Jurassic...
External links
- do Rio grande do Sul. (in PortuguesePortuguese languagePortuguese is a Romance language that arose in the medieval Kingdom of Galicia, nowadays Galicia and Northern Portugal. The southern part of the Kingdom of Galicia became independent as the County of Portugal in 1095...
) - Brasileira de Paleontologia. (in PortuguesePortuguese languagePortuguese is a Romance language that arose in the medieval Kingdom of Galicia, nowadays Galicia and Northern Portugal. The southern part of the Kingdom of Galicia became independent as the County of Portugal in 1095...
)