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plural spermospores
(physiology) The male germinal or seminal cell, from the breaking up of which the spermoblasts are formed and ultimately the spermatozoids. quotations
The spermatozoa are formed either by the direct division of the spermospores into a number of cells , spermoblasts , each of which grows into a spermatozoon ; or by the nucleus of the spermospore becoming subdivided within the cell body
1880-1881, Francis Maitland Balfour, A Treatise on Comparative Embryology