title: Spermatozoan vesicle loss during penetration of the female gonangium in the hydroid. Campanularia flexuosa.
mesh_terms: D000818:Animals; D002465:Cell Movement; D003063:Cnidaria / Q000166:cytology*; D005260:Female; D005306:Fertilization; D008297:Male; D008854:Microscopy, Electron; D013094:Spermatozoa / Q000166:cytology* / Q000502:physiology