About two new families of acanthodian fishes (Acanthodii)

Abstract

The article presents some information on two new families of Ptychodictyidae fam. nov. and Nostolepidae fam. nov. that were established on the basis of the author’s personal research and the available literature data. Their main diagnostic features, generic composition, number of species, comparison, stratigraphic and geographical distribution are given. The obtained data supplement the taxonomy of the Palaeozoic acanthodian fishes.