Chondrichthyes - Ischnacanthiformes
Parent taxon: Acanthodii according to C. J. Burrow and D. K. Elliott 2023
See also Burrow 2011, Dineley and Metcalf 1999, Long 2011 and Nelson et al. 2016
Sister taxa: Acanthodi, Acanthodida, Acanthodiformes, Antarctonchus, Archaeacanthus, Byssacanthoides, Campylodus, Climatiida, Climatiiformes, Diplacanthi, Diplacanthiformes, Eupleurogmus, Euthacanthidae, Gemuendolepis, Haplacanthus, Homacanthus, Ischnacanthida, Lupopsyroides, Lupopsyrus, Machaeracanthidae, Monopleurodus, Nodacosta, Nodonchus, Onchus, Parexus, Paucicanthus, Pinnacanthus, Promesacanthus, Ptychodictyon, Seretolepis, Sinacanthus, Striacanthus, Tetanopsyrus, Yealepis
Subtaxa: Acritolepidae Ischnacanthidae Ischnacanthus Podoliacanthus Poracanthodidae Serradentus Xylacanthus
Ecology: nektonic carnivore
Distribution:
• Devonian of Afghanistan (1 collection), Bolivia (1), Iran (1), New Zealand (1), Svalbard and Jan Mayen (1), Ukraine (1), the United Kingdom (1), United States (3: California, Nevada)
• Silurian of Australia (1), Canada (1: New Brunswick), China (4), Estonia (2), the United Kingdom (2)
Total: 20 collections including 24 occurrences