Pyrosome

Each zooid is only a few millimetres in size, but is embedded in a common gelatinous tunic that joins all of the individuals. Each zooid opens both to the inside and outside of the `tube`, drawing in ocean water from the outside to its internal filtering mesh called the branchial basket, extracting the microscopic plant cells on which it feeds, .....
Found on http://en.wikipedia.org/wiki/Pyrosome

Pyrosome

• (n.) Any compound ascidian of the genus Pyrosoma. The pyrosomes form large hollow cylinders, sometimes two or three feet long, which swim at the surface of the sea and are very phosphorescent.
Found on http://thinkexist.com/dictionary/meaning/pyrosome/

Pyrosome

Pyr'o·some noun [ Pyro- + - some body.] (Zoology) Any compound ascidian of the genus Pyrosoma . The pyrosomes form large hollow cylinders, sometimes two or three feet long, which swim at the surface of the sea and are very phosphorescent.
Found on http://www.encyclo.co.uk/webster/P/205
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