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Abstract
Progressive changes in shape and size with time of right valves of a series of forms of Aucellina Pompeckj, the best known of which is Aucellina, hughendenensis (Etheridge sen.), are demonstrated. The presumably genetically controlled variations took place during upper Albian times, i.e., during the time of deposition of what is known as the Tambo Formation of the Great Australian Artesian Basin. Systematic position and phylogeny of Aucellininae nov, are discussed.