New theropod remains from the Tiouraren Formation (?Middle Jurassic, Niger) and their bearing on the dental evolution in basal tetanurans

作者：Serrano Martinez Alejandro^*; Ortega Francisco; Sciscio Lara; Enrique Tent Manclus Jose; Fierro Bandera Ignacio; Knoll Fabien

来源：Proceedings of the Geologists Association, 2015, 126(1): 107-118.

DOI：10.1016/j.pgeola.2014.10.005

• Theropoda
• Megalosauridae
• Spinosauridae
• Jurassic
• Africa
• Dental morphology

A fragment of a maxilla and isolated theropod teeth from the (?) Middle Jurassic Tiouraren Formation are described. The specimens come from Tadibene, in the rural community of Aderbissinat, Thirozerine Department, Agadez Region, Niger. They were identified through direct comparison with teeth previously described in the literature as well as on the basis of discriminant and morphometric analyses. Our results suggest they belong to Ceratosauridae, Megalosauridae, and the oldest representatives of Spinosauridae. The analyzed sample shows some uncommon characters, such as spinosaurid-like ornamentation in megalosaurid-like teeth, or spinosaurid-like teeth with a low number of denticles, which sheds light on tooth morphology and dental evolution in basal tetanurans and early spinosaurids.

• 出版日期2015-2