School of Life Sciences | Ask A Biologist

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Sea Urchin Eggs

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  • Fertilize: when a sperm and an egg join.

Sea Urchin Eggs

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. 

urchin eggs

 

 

 

 

 

Juvenile sea urchins

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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Juvenile sea urchins

These are baby purple sea urchins called juveniles. Adult Strongylocentrotus purpuratus grow as big as a human fist. Image courtesy of Nancy Mozingo.

Be part of Ask A Biologist

by volunteering, or simply sending us feedback on the site. Scientists, teachers, writers, illustrators, and translators are all important to the program. If you are interested in helping with the website we have a Volunteer page to get the process started.