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Abstract
Sexual reproduction and auxospore formation of Achnanlhes javanica f. subconstricta have been observed in laboratory culture. This monoraphid diatom showed cis-type behavioural anisogamy and produced two auxospores in one of the paired gametangia. This diatom is unique in that the gametes become re-arranged only in the gametangium producing the stationary gametes, not in that producing the active gametes. Its position is thus obscure in the present classifications of sexual reproduction and auxospore formation. Some modification of these classifications is necessary.