Fine structure of the reproductive system of a frog lung fluke. II. Penetration of the ovum by a spermatozoon.
D000818:Animals; D001001:Anura; D002462:Cell Membrane; D005260:Female; D005306:Fertilization; D008297:Male; D008854:Microscopy, Electron; D010063:Ovum; D013094:Spermatozoa; D014200:Trematoda / Q000166:cytology*