sand dollar reproduction

From: Erich Hoyt (EHoyt@compuserve.com)
Date: Mon Oct 21 2002 - 05:58:02 EDT

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    Message text written by "johnruth.schwab"

    "
    How do sand dollars reproduce.

    "

    -------------------- End Original Message --------------------

    Sand dollars, like other echinoids (free-moving echinoderms which include
    sea urchins, heart urchins and sand dollars), are dioecious. That means
    that there are male and female reproductive organs on different
    individuals. Sand dollars shed their sperm and eggs into the sea water
    (some burrowing sand dollars have long genital papillae that allow the
    release of eggs or sperm above the sand surface). Fertilization then takes
    place in the water. At least one species of sand dollar actually broods the
    eggs but most do not.

    - Erich Hoyt

    email: ehoyt@compuserve.com

    Senior research associate, Whale and Dolphin Conservation Society
    Co-director, Far East Russia Orca Project

    Creatures of the Deep: In search of the sea's "monsters" and the world they
    live in. by Erich Hoyt. Published Nov. 2001 by Firefly Books (Canada, USA;
    distr. Chris Lloyd in UK). 160 pages, hardcover, 9 x 11 inches, all colour
    with photographs throughout, world seafloor map, illus., bibliog., index.
    $40 / 27.95.
    Outstanding Book of the Year Award, April 2002 - American Society of
    Journalists & Authors, Inc., New York

    www.fireflybooks.com/Nature/HOYT.html
    www.russianorca.narod.ru
    www.wdcs.org



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