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- Usually orange, sometimes red or dull purple
- Individual animals (zooids) arranged in loose circles, rows, or dense colonies
- Dense colonies can be extensive, creating firm, gelatinous coating on submerged structures; colony sometimes forms lobes
- Grows on rocks, shells, pilings, seaweeds, ship hulls, and other submerged surfaces
- Usually below low-tide line
Known Distribution in the Northeast
- Newfoundland to Florida
- Native to northwestern Pacific Ocean
- Competition with native species (invertebrates and algae) for living space
- Grows over other organisms, interfering with their feeding and other behaviors