Fig 55. Life cycle of a diatom: based on Stephanodiscus except that the position of the auxospore (c) and the formation of motile gametes (a) has not been seen in this particular genus. (d) Auxospore wall breaking open to reveal initial cell. (e) First division of initial cell to form two new normal hypovalves back to back. (f) One of the cells from stage (e) with a normal valve and an initial cell valve. (g) A cell formed following several divisions of (f) (the other cell is not illustrated but will be a replica of (f). (h), (i) Vegetative size reduction. (i) Small cell which will give rise to either the male or female (or+ or -) gametes.
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