Tooth of the oldest titanosauriform MSNM V 6216Your model is disabled. For more details go to Edit properties3D Model
This specimen is from a site near Ambondromamy (Madagascar), from the Isalo IIIb subunit (Sakaraha Formation), dated back to the Bathonian (Middle Jurassic).
The transverse section of this tooth is D-shaped, becoming quite irregular due to the presence of grooves and bulges that run apicobasally. A peculiar character of this tooth is the twisting of the crown, approaching the crown tip. This character has been considered to be a synapomorphy of Brachiosauridae (D’Emic 2012). This character led Bindellini & Dal Sasso (2019) to assume that this tooth might belong to a basal brachiosaurid, or at least the oldest known titanosauriform.
The specimen is housed at the Museo di Storia Naturale di Milano.
Reference: Bindellini G., Dal Sasso C. (2019). Sauropod teeth from the Middle Jurassic of Madagascar, and the oldest record of Titanosauriformes. Papers in Palaeontology. doi:10.1002/spp2.1282.