title: The ultrastructure of spermatogonia and germ cells of the germarium in Tetrodontophora bielanensis (Waga) (Collembola, Apterygota).
mesh_terms: D000818:Animals; D007313:Insecta / Q000648:ultrastructure*; D008297:Male; D008854:Microscopy, Electron; D013093:Spermatogonia / Q000648:ultrastructure; D013094:Spermatozoa / Q000648:ultrastructure*