title: Ultrastructural analysis of the motile apparatus of the aflagellate spermatozoon of macrostomum tubum.
mesh_terms: D000818:Animals; D008297:Male; D008854:Microscopy, Electron; D008870:Microtubules / Q000648:ultrastructure*; D013081:Sperm Motility; D013094:Spermatozoa / Q000648:ultrastructure*; D014419:Turbellaria / Q000648:ultrastructure*