thraustochytrid noun1 •Any protist in the order Thraustochytriales (syn. Thraustochytrida), that produce a network of filaments or tubes, on which the cells move and from which they absorb nutrients.The detritivores thraustochytrids and labyrinthulids have been associated with 22:5ɷ6 and 22:4ɷ6 [34 ]. — 2015 formsthraustochytrids