Abstract
AbstractIn Orthopyxis sperm entry apparently occurs at the site of emission of the polar bodies. If sperm are present from the time of spawning of the egg, they agglutinate head to head shortly after emission of the second polar body but only at a point on the egg surface under the second polar body. Since sperm agglutination does not occur elsewhere on the egg, it appears that this part of the surface of the egg of Orthopyxis and probably other hydromedusae is a special membrane patch which causes sperm to bind reversibly both to it, and to each other. The patch develops at a specific time during egg maturation and ceases function at or just after fertilization. Concomitant with the appearance of the patch is the production of a species‐specific sperm attractant by the egg. These results imply that the egg has strict control not only of the site and timing of sperm penetration but also of the time during which sperm are attracted to the egg.
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