†family Tristychiidae Moy-Thomas 1936 (cartilaginous fish)
Chondrichthyes - Hybodontiformes - Tristychiidae
Parent taxon: Hybodontoidea according to M. Ginter et al. 2010
See also Nelson et al. 2016
Sister taxa: Acrodontidae, Acrorhizodus, Asteracanthus semiverrucosus, Asteracanthus verrucosus, Diablodontus, Distobatidae, Homalodontidae, Hybodus strictus, Lamarodus, Lissodus, Lonchidiidae, Polyacrodontidae, Trichorhipis
Subtaxa: Tristychius
Ecology: nektonic carnivore
Distribution:
• Carboniferous of the United Kingdom (8 collections), United States (1: Scotland)
Total: 9 collections each including a single occurrence