Isochrysis

{{Short description|Genus of single-celled organisms}}

{{Automatic taxobox

| image = Isochrysis galbana.jpg

| image_caption = Isochrysis galbana

| taxon = Isochrysis

| authority = Parke, 1949

}}

Isochrysis is a genus of haptophytes.{{AlgaeBase genus |id=44564 |name=Isochrysis |access-date=26 March 2024}} Until recently this genus was also thought to contain the 'T-iso' algae frequently used in aquaculture; that species has been reclassified as Tisochrysis lutea.{{cite journal |last1=Bendif |first1=El Mahdi |last2=Probert |first2=Ian |last3=Schroeder |first3=Declan C. |last4=de Vargas |first4=Colomban |title=On the description of Tisochrysis lutea gen. nov. sp. nov. and Isochrysis nuda sp. nov. in the Isochrysidales, and the transfer of Dicrateria to the Prymnesiales (Haptophyta) |journal=Journal of Applied Phycology |date=December 2013 |volume=25 |issue=6 |pages=1763–1776 |doi=10.1007/s10811-013-0037-0 |url=https://doi.org/10.1007/s10811-013-0037-0|url-access=subscription }}