Pyrosoma atlanticum is a species of deep water colonial tunicate found in oceans around the world The colony forms a hollow cylinder that 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 which can be turned on and off causing a rhythmic flashing No neural pathway runs between the zooids but each responds to the light produced by other individuals and even to light from nearby colonies This P atlanticum colony was photographed in a tide pool in Pacific Grove California Photograph credit Rhododendrites Recently featured H M S Pinafore Bessie Coleman Half eagle Archive More featured pictures, wikipedia, wiki, book,


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