Moythomasia (named for James Alan Moy-Thomas) is an extinct genus of early ray-finned fish from the Devonian period of Europe and Australia. Moythomasia was a small freshwater fish, long. It had relatively large eyes, presumably to find prey in murky water. Its body was covered in specialized ganoid scales; the upper side of each scale sported a small pin that perfectly fit into the hollow lower side of the next scale. This allowed the fish to be both armored and flexible. Species M. devonica (Clarke, 1885) [Palaeoniscus devonicus Clarke, 1885; Rhadinichthys devonicus (Clarke, 1885)] M. durgaringa Gardiner & Bartram, 1977 M. lineata Choo, 2015 M. nitida Gross, 1953 M. perforata (Gross, 1942) [Aldingeria perforata Gross, 1942] References Devonian fish of Australia Devonian fish of Europe Palaeonisciformes Devonian bony fish Prehistoric ray-finned fish genera