Acanthodii - Ischnacanthiformes - Ischnacanthidae
Parent taxon: Ischnacanthiformes according to R. van der Laan 2019
See also Denison 1979, Jordan 1963 and Nelson et al. 2016
Sister taxa: Acanthospina, Acritolepidae, Podoliacanthus, Poracanthodidae, Serradentus, Tetanopsyridae, Xylacanthus
Subtaxa: Acanthodopsis Apateacanthus Arcticacanthus Cacheacanthus Gomphonchus Helenacanthus Ictinocephalus Ischnacanthus Marsdenius Persacanthus Rohonilepis Uraniacanthus
Type: Ischnacanthus
Ecology: nektonic carnivore
Distribution:
• Carboniferous of Australia (1 collection), the United Kingdom (2)
• Devonian of Australia (1), Bolivia (1), Canada (2: Nunavut), Greenland (1), Iran (1), New Zealand (1), Norway (1), the Russian Federation (1), the United Kingdom (9), United States (6: Nevada, Utah)
• Silurian of Australia (1), China (4), Estonia (2), Greenland (1), Lithuania (10), the United Kingdom (2)
Total: 47 collections including 54 occurrences