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From Fins to Wings
NOVEMBER 2006
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Photo caption by Jennifer Holland
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From Fins to Wings Gallery Photo

Sponge: Halichondria bowerbanki; Tunicates: Genus Botryllus; photographed at Marine Biological Laboratory, Woods Hole


Sea Sponges & Tunicates
Photograph by Rosamond Purcell

The animal kingdom dates back more than 600 million years, to when single-celled creatures—microscopic, water-sifting sacs propelled by undulating filaments—gave rise to many-celled animals like sponges and other marine invertebrates (yellow and orange masses).



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