Parent taxon: Crossopterygii according to C. R. Eastman 1903
See also Daly 1973, Hay 1902, Heintz 1934, Jordan 1963, Woodward 1891 and Young et al. 1992
Sister taxa: Achoania, Actinistia, Actinistia, Akinetia, Dipnomorpha, Dipnotetrapodomorpha, Guiyu, Lepidosireniformes, Ligulalepis, Onychodontia, Onychodontida, Osteolepidida, Psarolepis, Ptyctolepis, Rhipidistia, Rhizodontida, Tetrapoda, Haplistia, Amii, Platysomi, Polypterini, Heterocerci, Belonostomi, Eugnathi, Cyclolepidi, Taxistia, Saurodipterini, Lepidostei, Coelacanthini, Belonorhynchi
Subtaxa: Megalichthys
Ecology: planktonic suspension feeder
Distribution:
• Permian of Norway (1 collection)
• Carboniferous of the United Kingdom (8), United States (2: Iowa, West Virginia)
• Devonian of Antarctica (12), Australia (2), Belarus (3), China (1), United States (2: Nevada, Pennsylvania), Venezuela (1)
Total: 32 collections each including a single occurrence