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dc.contributor.advisorEl-Sayed, S. Z.
dc.creatorFryxell, Greta Albrecht
dc.description.abstractCultures of marine phytoplankton have Increasing value in morphological and taxonomic studies. Fifteen species of Thalassiosira have been studied from culture and field samples in both light and scanning electron microscopes, revealing consistent patterns that may be used in identification and taxonomic placement. Process patterns are considered good diagnostic characters, especially the patterns of strutted and labiate processes. The position of the strutted process inside or outside radial rows of areolae on the face of the valve is suggested to be of potential taxonomic value. The presence of spines is noted on a few species. The newly observed occluded process is found on three of the species discussed in detail; T. lundlana. T. tub!fera, and T. australis. Distributional data are considered in placing the diatoms in ecological categories. Suggested taxonomic groupings within the genus are based on the nature and placement of processes and patterns of areolae. Species discussed include: T. oestrupll. T. symmetrica. T. punctifera. T. elsayedil. T. eccentrica. T. lundiana, T. tublfeir. T. rotula, T. fluvlatilis. T. gracilis. T. tumlda. T. australis. and T. gravida.en
dc.format.extent189 leaves : illustrationsen
dc.rightsThis thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use.en
dc.subject.classification1975 Dissertation F948
dc.titleMorphology, taxonomy, and distribution of selected diatom species of Thalassiosira Cleve in the Gulf of Mexico and antarctic watersen
dc.typeThesisen A&M Universityen of Philosophyen
dc.contributor.committeeMemberCox, E. R.
dc.contributor.committeeMemberGeyer, R. A.
dc.contributor.committeeMemberHasle, G. R.
dc.contributor.committeeMemberRezak, R.
dc.contributor.committeeMemberWormuth, J. H.
dc.format.digitalOriginreformatted digitalen
dc.publisher.digitalTexas A&M University. Libraries

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