Osteichthyes - Protacanthopterygii
Full reference: R. Lund. 2000. The new Actinopterygian order Guildayichthyiformes from the Lower Carboniferous of Montana (USA). Geodiversitas 22(2):171-206
Parent taxon: Actinopterygii according to R. Lund 2000
Sister taxa: Acrognathus, Actinopteri, Aeduelliformes, Aesopichthyidae, Aetheospondyli, Aetheretmon, Aethocephalichthys, Akanolepis, Ameghinichthys, Anapterus, Apateodus, Asarotiformes, Aulolepis, Australichthys, Baoqingichthys, Beagiascus, Belonorhynchidae, Bobastraniiformes, Cheirodopsis, Chirothrix, Cladistia, Ctenothrissa, Cuneognathus, Dactylopogon, Dercetidae, Dinopteryx, Diplospondichthys, Echidnocephalus, Elonichthyiformes, Enchelurus, Engraulis, Exocoetoides, Globulodus, Guaymayenia, Gunterichthys, Halecopsis, Histiothrissa, Isospondyli, Kalops, Leptolepidae, Limnomis, Lineagruan, Mallotus, Mesolepis, Microcoelia, Nematonotus, Opistopteryx, Pachylebias, Palaeonisciformes, Paramblypteriformes, Parascopelus, Paratarrasius, Peltopleuriformes, Perleidiformes, Plethodus, Polypteri, Prolebias, Pronotacanthus, Protaulopsis, Protospondyli, Pseudoberyx, Redfieldiformes, Reticulolepis, Rhadinichthyidae, Rhinellus, Rhynchorhinus, Roslerichthys, Salmo, Sardinioides, Sardinius, Saurichthys, Scombroclupea, Scopeloides, Spinofacia, Tarrasiiformes, Teleosteomorpha, Telepholis, Tetragonopterus, Thryptodus, Wardichthys
Subtaxa: Guildayichthyidae
Ecology: