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Pyrosoma atlanticum
Pyrosoma atlanticum is a species of deepwater colonial tunicate found in oceans around the world. The colony forms a hollow cylinder which can grow up to 60 cm (24 in) long. The constituent zooids, which may be pink, yellowish, or bluish, form a rigid tube; each zooid has a pair of luminescent organs that can be turned on and off, causing rhythmic flashing. No neural pathway runs between the zooids, but each responds to the light produced by other individuals, and even by light from nearby colonies. This colony was found washed ashore in California.Photograph credit: Rhododendrites

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