Tubipora


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Related to Tubipora: Acropora

Tubipora

 

(organ-pipe coral), a genus of eight-tentacled, colonial coral polyps (Anthozoa) of the order Alcyonaria. The foundation of the colony is a skeleton of numerous parallel, dark-red limestone tubules that are up to 20 cm long and are joined by transverse platelike platforms. The corals resemble organ pipes. Inside the tubules are polyps with a bright-green crown of tentacles. Organ-pipe corals inhabit the tropical shallows of the Pacific and Indian oceans, usually among coral reefs.

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5 mm (BDH laboratory sand); red calcareous sand of the same particle size obtained from the organ-pipe coral Tubipora musica; and fragments of a coralline alga, Lithothamnium sp.
To test the differences in behavior between the upper and lower surfaces of the sponge ectosome, a thin layer of a mixture (1:1) of the BDH siliceous and Tubipora calcareous sands was laid down on the upper ectosome of five specimens that had attached to the bottom of an aquarium covered by the same mixture.