Revision of the actinopterygian genus Mimipiscis(= Mimia) from the Upper Devonian Gogo Formation of Western Australia and the interrelationships of the early Actinopterygii

The Devonian actinopterygian Mimia Gardiner & Bartram (1977) of the UpperDevonian (Frasnian) Gogo Formation of Western Australia, one of the most completely known ofall Palaeozoic ray-finned fishes, is renamed Mimipiscis nom. nov. due to preoccupation of the formergenus by the butterfly Mimia Evans (1953). Recently acquired data, including the description ofnewly prepared fossil material, has revealed the presence of a second species in this formerlymonotypic genus, as well as previously unreported features of the tail, parasphenoid and ontogeneticvariability of type species, Mimipiscis toombsi (Gardiner & Bartram 1977). The second form,Mimipiscis bartrami sp. nov., differs from the contemporary M. toombsi in details of the body shape,squamation, snout, suboperculum and parasphenoid. Phylogenetic analyses recover Mimipiscis andGogosardina as sister genera within a monophyletic Mimiidae, a clade restricted to the LateDevonian of Western Australia.