'The family Haplolepidae Westoll 1944 comprises a monophyletic complex of Carboniferous-age actinopterygians marked by a unique combination of characters which collectively trend toward a "subholostean" level of organization. Members of this family show reduction of key elements including the rostrum, opercular series, branchiostegal rays, and fin rays. Other advanced tendencies are ossified centra in at least one species (Microhaplolepis ovoidea) and the possibility that the maxilla may have been freed from the cheek, a characteristic of neopterygians such as Semionotus and Lepidotes (Baum & Lund, 1974).' Huber 1992.

There’s a note on the Nưřany Lake here: https://www.researchgate.net/publication/265318593_The_main_Late_Carboniferous_and_Early_Permian_lake_fish_communities_of_the_Czech_Republic