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Fine structural evidence shows that Collozoum serpentinum differs substantially from two previously examined species Collozoum inerme and Collozoum caudatum. The latter two have spheroidal to prolate central capsules with rounded nuclei and radially arranged lobes of cytoplasm radiating from the center of the central capsules. C. serpentinum has contorted, elongated (greater than 1 mm) cylindrical...
The cytoplasmic fine structure of Tetrapetalon elegans (synonym?: Hexalonche amphisiphon) is characterized by loosely arranged radial lobes extending from a centrally located, lobate nucleus. The capsular wall is thin (ca. 250 nm) composed of a membranous envelope, and there is no evidence of fissures as occur in thicker central capsular walls, e.g., Thalassicolla sp. The fusules project through...
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