title: Spermatozoan morphology and zygote formation in nematodes.
mesh_terms: D000818:Animals; D001200:Ascaris / Q000166:cytology; D007314:Insemination; D008297:Male; D008854:Microscopy, Electron; D009348:Nematoda / Q000166:cytology* / Q000502:physiology; D013094:Spermatozoa / Q000032:analysis / Q000166:cytology* / Q000254:growth & development; D013321:Strongyloides / Q000166:cytology