The zoospore of Schizochytrium aggregatum

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Abstract
The zoospore ultrastructure of the marine protist Schizochytrium aggregatum was examined in detail. The zoospores of S. aggregatum differed considerably from the zoospores of the presumably closely related marine protist Thraustochytrium. The flagella of S. aggregatum emerged from an erumpent area and followed along shallow grooves on the spore body. The mastigonemes of the anterior flagellum are localized along one-third the circumference of the flagellar shaft. There is a concertina-like structure just distal to the kinetosome terminal plate and osmiophilic granules are present within the kinetosome lumen. Microtubular bundles are associated with the kinetosomes and form a "backbone root" system. Serial reconstructions show that each zoospore contains a single tubular mitochondrion. Closely associated with the mitochondrion is a single microbody which in turn is appressed to the nuclear membrane. The ultrastructural data suggest that Schizochytrium aggregatum can be accommodated among the Fungi.