Named By: J. le Loeuff - 1993.
Classification: Chordata, Reptilia, Dinosauria, Saurischia, Sauropoda, Titanosauria.
Species: I. valdensis (type).
Size: Unknown due to overall lack of fossils.
Known locations: England, Isle of Wight Wessex Formation.
Time period: Barremian of the Cretaceous.
Fossil representation: Caudal (tail) vertebrae.
is a genus of titanosaurian
dinosaur, though one that is widely
regarded as dubious. Why it is dubious stems all the way back to
1887 when Richard Lydekker named two caudal vertebrae (BMNH R146a
and BMNH 151) as belonging to the genus Onithopsis.
reason for this was that fossils of the tail of Onithopsis
known, though others such as Harry Govier Seeley and John Hulke
criticised this decision, because if Onithopsis
tail vertebrae were
not already established in relation to other fossils, then there was
no way of knowing if these new caudal vertebrae truly belonged to
Onithopsis. In addition to this a similarity to
the caudal vertebrae
was also noted.
In 1888, Lydekker moved the caudal vertebrae from Onithopsis into Titanosaurus as Titanosaurus sp. a, while also moving a third vertebra (BMNH 32390) into Titanosaurus sp. b. Then in 1929, Friedrich von Huene named these as distinct species of Titanosaurus, with BMNH R146a and BMNH 151 becoming T. valdensis and BMNH 32390 becoming T. lydekkeri. Then nothing much happened until 1993 when Jean le Loeuff re-described these two species as a new genus called Iuticosaurus. This made Titanosaurus Valdensis and Titanosaurus lydekkeri into Iuticosaurus Valdensis and Iuticosaurus lydekkeri, however, le Loeuff soon considered I. lydekkeri to be a nomen dubium.
Currently, Iuticosaurus is only represented by two caudal vertebrae that don’t really present much more than a generic titanosaurian form, which has led others to speculate that the Iuticosaurus genus is itself dubious.
- On certain dinosaurian vertebrae from the Cretaceous of India and the Isle of Wight. - Quarterly Journal of the Geological Society of London 43: 157–160. - R. Lydekker - 1887.
- Catalogue of fossil reptilia and Amphibia in the British Museum. Pt. I. Containing the orders Ornithosauria, Crocodilia, Dinosauria, Squamata, Rhynchocephalia, and Proterosauria. - British Museum of Natural History, London. - R. Lydekker - 1888.
- Los saurisquios y ornitisquios del Cretáceo Argentino. - Anales del Museo de La Plata (series 3) 3: 1–196 - F. von Huene - 1929.
- European titanosaurids. - Revue de Paléobiologie, Volume Spéciale 7:105-117 - J. Le Loeuff - 1993.
- Découverte d'Hadrosauridae (Dinosauria, Ornithischia) dans le Maastrichtien des Corbières (Aude, France). - Comptes Rendus de l'Academie des Sciences, Série II 316: 1023-1029. - J. le Loeuff, E. Buffetaut, M. Martin, V. Martin & H. Tong - 1993.