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Abstract
Navicula muscatinei was isolated from foraminifera growing near the southern end of the Great Barrier Reef. This diatom, which grows as a naked zooxanthella in its foraminiferan hosts, can form normal frustules in culture, but it often gives rise to frustules with distorted raphe systems and striation, and can also form large spherical or dumb-bell-shaped cells. Some at least of the large cells are multinucleate. They bear scales, in which an abnormal raphe is usually visible, subtending a somewhat irregular system of ribs. The significance of the large cells remains unclear but it is suggested that they may be autosporangia.
