The fine structure of the sea urchin spermatozoa as revealed by the electron microscope.
D000818:Animals; D004447:Echinodermata; D004583:Electrons; D008297:Male; D008853:Microscopy; D008854:Microscopy, Electron; D012617:Sea Urchins; D013094:Spermatozoa
ECHINODERMS; MICROSCOPY, ELECTRON; SPERMATOZOA