title: The ultrastructure of the aflagellate spermatozoon of the freshwater turbellarian Hydrolimax grisea (Platyhelminthes: Plagiostomidae).
mesh_terms: D000818:Animals; D008297:Male; D013094:Spermatozoa / Q000648:ultrastructure*; D014419:Turbellaria / Q000648:ultrastructure*