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This animal is commonly known as sand sponge although it is not a sponge at all. This animal is a compound ascidean composed of many individuals. This animal forms low, rounded colonies on the bottom. A fleshy tunic surrounds the individual zooids. This tunic is heavily infiltrated with sand. The colonies are composed of many individual cauliflower-like lobes each of which represents a zooid system with a common exit opening at the top of the lobe.

Gosner, K.L., A Field Guide to the Atlantic Seashore, 1979, Houghton Mifflin Company

Barnes, R.D., Invertebrate Zoology, 1980, Saunders College and Holt, Rinehart and Winston.

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David Remsen
Side view of several lobes of colony.

David Remsen
Side view of several lobes of colony. More elevated than above photo.

Gray Slides
Close up showing sand grains in tunic
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