My dad sent me this great video of sand dollar or sea biscuit development. You can see the progress from fertilization to larval stages to settlement. You don't see it at it's adult stage except briefly at the beginning, but it is cool to see what the joining of gametes leads to! This is a particularly beautiful demonstration of echinoderm development.
A Sea Biscuit's Life from Bruno Vellutini on Vimeo.
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