Habroichthys minimus

Habroichthys is an extinct genus of marine peltopleuriform ray-finned fish from the Middle Triassic, and is the only genus of the monotypic family Habroichthyidae. Fossils of the fish have been found in a number of countries being Slovenia, Italy, and China. Species within the genus were small with the largest species having a standard length of only 50 millimetres (2.0 in). Due to their small size, the preservation of the skull bones of the fish are usually poorly preserved, resulting in species being identified by the number of flank scales along with the placement of certain fins on the body. Within their environment, Habroichthys would have been a very common fish and would have contributed a large amount of biomass in their ecosystems. Overall, these fish would have most likely behaved like a number of modern schooling fish that swim near the water's surface. There are currently 12 valid species attributed to the genus.