Janassa is an extinct genus of petalodont cartilaginous fish that lived in marine environments in what is now central United States of America and Europe during the Carboniferous and upper Permian. It is known from teeth and a few poorly preserved body fossils from Germany (Kupferschiefer, Upper Permian) and England (Marl Slate, Upper Permian). According to the fossils, Janassa had a body plan very similar to that of the modern skate. Its teeth suggest it crushed and ate shellfish, such as brachiopods. References Petalodontiformes Carboniferous fish of North America Carboniferous cartilaginous fish Permian cartilaginous fish Permian fish of Europe Prehistoric cartilaginous fish genera Fossils of Germany Kupferschiefer Fossil taxa described in 1899