Proteomonas sulcata gen. et sp. nov. (Cryptophyceae), a cryptomonad with two morphologically distinct and alternating forms

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Abstract
Proteomonas sulcata gen. et sp. nov. (Cryptophyceae) is described from Australian waters. It has an unusual life history involving two morphologically distinct and alternating forms that are identified as haploid and diploid stages. Both the haplomorph and the diplomorph reproduce by simple cell division, and each is capable of producing the other cell type. The two forms can be distinguished by size, periplast structure, configuration of the flagellar apparatus, and the quantity of nuclear DNA. Details of the life history and morphology of this cryptomonad are presented and discussed with reference to cryptomonad taxonomy.