Moythomasia (named for James Alan Moy-Thomas) is an extinct genus of early ray-finned fish from the Devonian period, known from fossils found in Europe and Australia.
Moythomasia was a small freshwater fish, measuring about in length. It had relatively large eyes, likely to help it locate prey in murky water. Its body was covered in specialized ganoid scales; the upper side of each scale featured a small pin that perfectly fit into a hollow on the lower side of the adjacent scale. This unique structure provided both armor and flexibility.
Species M. devonica (Clarke, 1885) [Palaeoniscus devonicus Clarke, 1885; Rhadinichthys devonicus (Clarke, 1885)] M. durgaringa Gardiner & Bartram, 1977 M. lebedevi Plax, Bakaev & Naugolnykh, 2025 M. lineata Choo, 2015 M. nitida Gross, 1953 M. perforata (Gross, 1942) [Aldingeria perforata Gross, 1942]
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