Principia | |
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Scientific classification | |
Clade: | Archaeplastida |
Division: | Rhodophyta |
Class: | Florideophyceae |
Stem group: | Corallinales |
Family: | †Archaeolithophyllaceae |
Genus: | †Principia |
Principia is a genus of alga that has been placed in the coralline stem group on the basis of its slightly differentiated thallus; it forms an "intermediate" between Hortonella, Neoprincipia and Archaeolithophyllum.[1]