Sea Urchin

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Fertilize: when a sperm and an egg join.

Sea Urchin Development from 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

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Bibliographic details:

  • Article: Sea Urchin Development - Eggs and Beyond
  • Author(s): CJ Kazilek
  • Publisher: Arizona State University School of Life Sciences Ask A Biologist
  • Site name: ASU - Ask A Biologist
  • Date published: December 23, 2009
  • Date accessed: April 13, 2024
  • Link:

APA Style

CJ Kazilek. (2009, December 23). Sea Urchin Development - Eggs and Beyond. ASU - Ask A Biologist. Retrieved April 13, 2024 from

American Psychological Association. For more info, see

Chicago Manual of Style

CJ Kazilek. "Sea Urchin Development - Eggs and Beyond". ASU - Ask A Biologist. 23 December, 2009.

MLA 2017 Style

CJ Kazilek. "Sea Urchin Development - Eggs and Beyond". ASU - Ask A Biologist. 23 Dec 2009. ASU - Ask A Biologist, Web. 13 Apr 2024.

Modern Language Association, 7th Ed. For more info, see
Young 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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