Thomasia is a mammaliaform from the family Haramiyidae.http://palaeos.com/vertebrates/mammaliformes/mammaliformes.html#Haramiyida Palaeos on Haramiya from the Late Triassic of Europe. It is only known from teeth.Zofia Kielan-Jaworowska, Richard L. Cifelli, and Zhe-Xi Luo, Mammals from the Age of Dinosaurs: Origins, Evolution, and Structure (New York: Columbia University Press, 2004), 249–260.
Distribution Fossils of the genus have been found in:Thomasia at Fossilworks.org Triassic Sables and Grès de Mortinsart Formations, Gaume, Belgium Microlestes Quarry, Frome, England Exter and Trossingen Formations, Germany Auf dem Heftgen, Syren, Luxembourg Klettgau Formation, Switzerland Gres à Avicula contorta Formation, Franche-Comté and Lorraine, France
Jurassic Pant Fissure System 4, Pant Quarry, St Brides Major (community), Wales
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