| Principia | |
|---|---|
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.
- Cózar, P. (2003). "Neoprincipia nov. gen., a new Mississippian red alga, and remarks on the Archaeolithophyllaceae (Rhodophyta)". Geobios. 36 (5): 505–517. doi:10.1016/S0016-6995(03)00060-3.
| Taxon identifiers | |
|---|---|
| Principia | |