Abstract
ABSTRACT The spermatozoan of Uca tangeri consists of a large spherical acrosome, a cup-shaped filamentous nucleus, which extends into numerous radiating arms, and a thin cytoplasmic band. Oocytes from ripe ovaries and sperm from seminal receptacles were mixed in filtered sea water, fixed at different times, and examined under a scanning electron microscope. Several spermatozoa became attached by the arms to the surface of each oocyte. The sperm bound to oocytes underwent the acrosome reaction, which started with swelling of the acrosomal vesicle followed by extrusion of its contents. Subsequently, the perforatorium projected forward ∼ 1 µm beyond the apical end of the extruded acrosomal vesicle contents. As the ejected perforatorium becomes the leading edge of the reacted sperm, it is thought to be the constituent at which level membrane fusion between both gametes must occur.
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