Named By: Bruno A. Navarro, Aline Marcele Ghilardi, Tito Aureliano, Verónica Díez Díaz, Kamila L.N. Bandeira, André Cattaruzzi, Fabiano Vidoi Iori, Ariel M. Martine, Alberto B. Carvalho, Luiz E. Anelli, Marcelo Adorna Fernandes & Hussam Zaher - 2022.
Classification: Chordata, Dinosauria, Saurischia, Sauropoda, Titanosauria, Lithostrotia, Saltasauridae, Saltasaurinae.
Species: I. parva (type).
Size: Holotype estimated to have been about 5.7 meters long.
Known locations: Brazil -São José do Rio Preto Formation.
Time period: Santonian to Campanian of the Cretaceous.
Fossil representation: Partial post cranial skeletal remains.
is a genus of titanosaurian
dinosaur that lived in South America during
the late Cretaceous. While South America is known to have at times
been home to some truly giant titanosaurs, Ibirania
is at the extreme
polar opposite of the size scale. Though incomplete,
reconstructions of the holotype individual suggest Ibirania
barely six meters long.
Dwarf titanosaurs are not unknown, Magyarosaurus and Europasaurus from Europe are both estimated to have only been about six meters long. However, at the time these dinosaurs lived, Europe was essentially a large island chain, and the small size of these dinosaurs is thought to have been a result of evolution pushed by insular dwarfism. Ibirania however lived on a continent that was thought to have been a relatively large land mass, even in the late Cretaceous. So could it be there was something about the geology of ancient South America that we don’t yet know, or was there another factor responsible for Ibirania growing much smaller than its giant relatives and neighbours? At the time of writing, no one can be really sure.
Small size aside, study of the cervical vertebrae of Ibirania has confirmed the presence of an avian-like air sac system for respiration. The presence of such respiratory development in dinosaurs has long been theorized, but this discovery in Ibirania helps to shed more light on this area of dinosaur biology.
- A new nanoid titanosaur (Dinosauria: Sauropoda) from the Upper Cretaceous of Brazil. - Ameghiniana. 59 (5): 317–354. - Bruno A. Navarro, Aline Marcele Ghilardi, Tito Aureliano, Verónica Díez Díaz, Kamila L.N. Bandeira, André Cattaruzzi, Fabiano Vidoi Iori, Ariel M. Martine, Alberto B. Carvalho, Luiz E. Anelli, Marcelo Adorna Fernandes & Hussam Zaher - 2022.