Thomasia is a mammaliaform from the family Haramiyidae. from the Late Triassic of Europe. It is only known from teeth.
Distribution Fossils of the genus have been found in:
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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