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A 'spermatogonium' (plural: ''spermatogonia'') is an intermediary male gametogonium (a kind of germ cell) in the production of spermatozoa.
There are two subtypes:
'Type A(d)' cells have dark nuclei and they divide to produce copies of themselves, thereby ensuring a constant supply of spermatogonia to fuel spermatogenesis.
'Type A(p)' cells have pale nuclei and they divide by mitosis to produce Type B cells and these Type B cells divide again to give rise to ''primary spermatocytes''.
Each primary spermatocyte duplicates its DNA and subsequently undergoes meiosis I to produce two haploid secondary spermatocytes. Each of the two secondary spermatocytes further undergo meiosis II to produce two spermatids (haploid). (1 primary spermatocytes => 4 spermatids)
The spermatids then undergo spermiogenesis to produce spermatozoa.

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This article includes material from Biology Online.