title: Comparative morphometrics of the acrosomes of the sperms of "externally" and "internally"  fertilizing sperms of the shipworms (Teredinidae, Bivalvia, Mollusca).
mesh_terms: D000818:Animals; D001699:Biometry; D049872:Bivalvia / Q000166:cytology* / Q000502:physiology; D002467:Cell Nucleus; D003594:Cytoplasmic Granules; D005306:Fertilization; D008297:Male; D008854:Microscopy, Electron; D013094:Spermatozoa / Q000166:cytology*