Chondrocladia concrescens (formerly Cladorhiza concrescens) is a species of deep-sea carnivorous sponge in the family Cladorhizidae. It is commonly known as the "ping pong tree sponge".
Description Alexander Agassiz described the sea sponge as "a long stem ending in ramifying roots, sunk deeply into the mud. The stem has nodes with four to six club-like appendages".
See also Cladorhizidae Eltanin Antenna Sponge
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