Cross fertilization between sea urchin eggs and oyster spermatozoa

Kenzi Osanai, Kei‐ichiro ‐i Kyozuka

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


Interphylum crossing was examined between sea urchin eggs (Temnopleurus hardwicki) and oyster sperm (Crassostrea gigas). The eggs could receive the spermatozoa with or without cortical change. The fertilized eggs that elevated the fertilization envelope began their embryogenesis. Electron microscopy revealed that oyster spermatozoa underwent acrosome reaction on the sea urchin vitelline coat, and their acrosomal membrane fused with the egg plasma membrane after the appearance of an intricate membranous structure in the boundary between the acrosomal process and the egg cytoplasm. Oyster spermatozoa penetrated sometimes into sea urchin eggs without stimulating cortical granule discharge and consequently without fertilization envelope formation. The organelles derived from oyster spermatozoa seemed to be functionally inactive in the eggs whose cortex remained unchanged.

Original languageEnglish
Pages (from-to)49-60
Number of pages12
JournalGamete Research
Issue number1
Publication statusPublished - 1982


  • cross fertilization
  • oyster sperm
  • sea urchin egg

ASJC Scopus subject areas

  • Genetics
  • Developmental Biology


Dive into the research topics of 'Cross fertilization between sea urchin eggs and oyster spermatozoa'. Together they form a unique fingerprint.

Cite this