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The "mystery" tunicate (Didemnum sp.) has been found in Japan, New Zealand and the West Coast.
It looks like a sponge and grows on hard surfaces such as pilings, floating docks, and rocky ledges.
It can grow to a couple feet long, and has recently been found from New Hampshire to Connecticut.
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The sea squirt (Diplosoma listerianum) may look like a gray fungus growing over other animals, on pilings,
on floating docks, and on hard surfaces under the water.
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The purple sea anemone (Sagartia elegans) has been found only on the North shore. It is small and attached to hard surfaces below the water.
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The European oyster (Ostrea edulis) is an introduced escapee from an aquaculture industry and can be found in shallow water areas attached to hard surfaces. Shells may be found on the beach.
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The Asian shore crab (Hemigrapsus sanguineus) is found under rocks from mid- to low tide on gravelly and rocky beaches.
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The barnacle on the left is the native barnacle (Semibalanus balanoides), the one on the right is a New Zealand species (Elminius modestus) introduced to Europe and may arrive here.
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