Chondrichthyes - Ischnacanthiformes - Ischnacanthidae
Parent taxon: Ischnacanthiformes according to J. S. Nelson et al. 2016
See also Denison 1979 and Jordan 1963
Sister taxa: Acanthospina, Acritolepidae, Ischnacanthus, Podoliacanthus, Poracanthodidae, Serradentus, Xylacanthus
Subtaxa: Acanthodopsis Apateacanthus Arcticacanthus Cacheacanthus Gomphonchus Helenacanthus Ictinocephalus Marsdenius Persacanthus Rohonilepis Uraniacanthus
Ecology: nektonic carnivore
Distribution:
• Carboniferous of Australia (1 collection), the United Kingdom (2)
• Devonian of Australia (1), Bolivia (1), Canada (1: Nunavut), Greenland (1), Iran (1), New Zealand (1), Norway (1), the Russian Federation (1), the United Kingdom (6), United States (5: Nevada, Utah)
• Silurian of Australia (1), China (4), Estonia (2), Greenland (1), Lithuania (10)
Total: 40 collections including 45 occurrences