Subclass Ahnfeltiophycidae (red algae)
Florideophyceae - Ahnfeltiophycidae - Ahnfeltiophycidae
Parent taxon: Florideophyceae according to C. W. Schneider and M. J. Wynne 2007
Sister taxa: Corallinophycidae, Corallinophycidea, Cryptonemiales, Dawsoniolithon, Hildenbrandiophycidae, Nemaliophycidae, Prismostylus, Rhodymeniophycidae
Subtaxa: Ahnfeltiales Pihiellales