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Evolution of sand dollars in time and space. Ornamentation indicates the present day distribution of the various groups of sand dollars. Stars and circles on the map mark approximate centers of origin for lineages as indicated;
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bss.sfsu.edu/geog/bholzman/courses/fall02%20projects/sa...
bss.sfsu.edu/geog/bholzman/courses/fall02%20projects/sandollar/sanddollar.html
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" ; How do sand dollars reproduce. ... 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.
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whale.wheelock.edu/archives/ask02/0230.html
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Sand dollars reproduce through pores. Spawning adults shoot out clouds of eggs or sperm. The eggs are fertilized by the moving currents. They develop into tiny swimming larvae. After a month the larvae sink to the bottom, and then start to grow a protective shell.
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www.gtlsys.com/FossilForum/Archive/messages/925.html
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Sand dollars belong to the class Echinodea, which also includes sea urchins. They are Echinoderms, which also includes starfish (Asteroidea), sea cucumbers (Holothuroidea), brittle stars (Ophiuroidea), and sea lilies (Crinoidea).
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www.madsci.org/posts/archives/oct99/939998242.Gb.r.html
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Subject: How do Sand Dollars reproduce? ... Date: Sat Oct 9 09:13:37 1999; Posted by Matt Leach; Grade level: grad (non-science) School: No school entered.; City: ... I've been trying to find this out for years, just for simple curiosity. You see "baby" sand dollars, but where do they come from? What is their life-cycle?
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www.madsci.org/posts/archives/oct99/939998242.Gb.q.html
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Sand dollars are from the class of marine animals known as Echinoids, spiny skinned creatures. Their relations include the sea lily, the sea cucumber, the star fish and the sea urchin. ... Sand dollars live beyond mean low water on top of or just beneath the surface of sandy or muddy areas. The spines on the...
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octopus.gma.org/Tidings/sanddollar.html
octopus.gma.org/Tidings/sanddollar.html
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Some sponges also reproduce asexually; ... Sand Dollars have tiny tube feet that are used as gills. The holes on the top surface are where the eggs and sperm are released. Diet: Sand Dollars eat tiny particles of food that float in the water. Predators: Sand Dollars are eaten by sea stars (also known as starfish), snails,
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www.unsolvedmysteries.com/usm414343.html
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Sand dollars are members of a group of animals called echinoderms, that include sea urchins and starfish. An adult sand dollar (Dendraster excentricus) is a flat, round disc that lives a sedate life on the sea floor.
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scienceblogs.com/notrocketscience/2008/03/sand_dollars_...
scienceblogs.com/notrocketscience/2008/03/sand_dollars_avoid_predators_by_cloning_themselves.php
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