Fertilize: when a sperm and an egg join.
This is a light microscope photograph of sea urchin eggs after they have been fertilized. You can see the eggs surrounded by a layer, called the jelly layer. The light dots are the sperm. The eggs look blue in color, because of the microscope light.
CJ Kazilek. (2009, December 23). Sea Urchin Development - Eggs and Beyond. ASU - Ask A Biologist. Retrieved September 4, 2024 from https://askabiologist.asu.edu/sea-urchin-eggs
CJ Kazilek. "Sea Urchin Development - Eggs and Beyond". ASU - Ask A Biologist. 23 December, 2009. https://askabiologist.asu.edu/sea-urchin-eggs
CJ Kazilek. "Sea Urchin Development - Eggs and Beyond". ASU - Ask A Biologist. 23 Dec 2009. ASU - Ask A Biologist, Web. 4 Sep 2024. https://askabiologist.asu.edu/sea-urchin-eggs
These are baby purple sea urchins called juveniles. Adult Strongylocentrotus purpuratus grow as big as a human fist. Image courtesy of Nancy Mozingo.
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