Gremiphyca

{{Use dmy dates|date=October 2023}}

{{Short description|Extinct genus of algae}}

{{automatic taxobox

| fossil_range = Doushantuou

| taxon = Gremiphyca

| authority = Zhang et al., 1998{{cite journal|last1=Zhang|first1=Y|last2=Yin|first2=L|last3=Xiao|first3=S|last4=Knoll|first4=AH|year=1998|title=Permineralized fossils from the terminal Proterozoic Doushantuo Formation, South China|journal=Journal of Paleontology|volume=72|issue=4, Supplement|pages=1–52|doi=10.1017/S0022336000059977|jstor=1315592|bibcode=1998JPal...72S...1Z|s2cid=132715240}}

| subdivision_ranks = Species

| subdivision = {{extinct}}G. corymbiata Zhang et al., 1998

}}

Gremiphyca is a lobed, non-mineralized alga with a pseudoparenchymatous thallus, dating to the Ediacaran period.{{Cite journal | last1 = Xiao | first1 = S. | last2 = Knoll | first2 = A. H. | last3 = Yuan | first3 = X. | last4 = Pueschel | first4 = C. M. | title = Phosphatized multicellular algae in the Neoproterozoic Doushantuo Formation, China, and the early evolution of florideophyte red algae | journal = American Journal of Botany | volume = 91 | issue = 2 | pages = 214–227 | year = 2004 | pmid = 21653378 | doi = 10.3732/ajb.91.2.214| doi-access = free }} The genus was reinvestigated by Xiao et al. and was interpreted to be a stem-group florideophyte.