Sand Dollars

Here's a wonderful video on the development stages of sand-dollars (also known as sea biscuits)



A Sea Biscuit's Life from Bruno Vellutini on Vimeo.

Some points to take home:

• The larval form of sand dollars, has bidirectional symmetry, unlike the (more dominant) radial symmetry of the adult form.
• Sand dollars have male and females individuals. However, sand dollars larvae can clone themselves.
• Echinoderms, in general, are cool. One of my fondest memories of visiting Seattle is petting a sea urchin in the city's aquarium.