| Principia | |
|---|---|
| Scientific classification  | |
| (unranked): | 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]
- ↑ 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.
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