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ABSTRACT
A new marine protist frequently isolated from marine vascular plants and algae is described. The uninucleate, scale-covered cells have a prominent, refractive lipid body and branched, organelle-free ectoplasmic elements extending from their polar extremities. The protist moves by ectoplasmic elements which do not arise from the membrane-generating sagenogens characteristic of the labyrinthulids. Observations on cellular ultrastructure, motility, and habitat are presented as well as comparisons with labyrinthulids, Sorodiplophrys stercorea, and Diplophrys archeri.