Subfamily Plagiacanthinae Hertwig 1879
Polycystinea - Nassellaria - Plagiacanthidae
Parent taxon: Plagiacanthidae according to P. De Wever et al. 2001
Sister taxa: Helotholus, Mitrocalpis, Pteroscenium, Zaldacriinae, Zamolxinae
Subtaxa: Dumetum Jeanpierria Neosemantis Paracystidium Pentaplagia Plagiacantha Plagonium Plectagonidium Polyplecta Tetraplagia Tetraplecta
Type: Plagiacantha
Distribution:
• Quaternary of Japan (6 collections)
• Eocene of New Zealand (2)
• Jurassic of Japan (2)
Total: 10 collections each including a single occurrence