Protoperidinium subgenus Archaeperidinium Appendix B
From dinoflaj3
PROTOPERIDINIUM subgenus ARCHAEPERIDINIUM (Jörgensen, 1912, p.6) Lebour, 1922, p.809. Modern subgenus defined from the motile stage. Originally Archaeperidinium, subsequently (and now) Protoperidinium subgenus Archaeperidinium.