†Nipponophycus Yabe and Toyama (green alga)
Bryopsidophyceae - Caulerpales - Halimedaceae
Parent taxon: Halimedaceae according to F. Schlagintweit 2005
Sister taxa: Alpinocodium, Boueina, Brandneria, Calabricodium, Collarecodium, Egericodium, Eugonophyllum, Felixporidium, Halimeda, Hydracara, Madonicodium, Trelonella, Saccamminopsis, Palaeoporella, Cayeuxia
Subtaxa: Nipponophycus kanmerai
Ecology: stationary epifaunal "photoautotroph"