Strongylocentrotus franciscans

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Strongylocentrotus franciscans

echinoderm

Also known as: giant red urchin

Learn about this topic in these articles:

gametic isolation

In evolution: Gametic isolation
Strongylocentrotus purpuratus and S. franciscanus can be induced to release their eggs and sperm simultaneously, but most of the fertilizations that result are between eggs and sperm of the same species. In animals with internal fertilization, sperm cells may be unable to function in the sexual ducts of…
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