Sea pen
Order of colonial marine cnidarians
Sea pen
Sea pens are marine cnidarians belonging to the superfamily Pennatuloidea. They are fleshy colonial organisms anchored to the seabed, with tiny polyps embedded in a soft matrix. They have a cosmopolitan distribution, being found in tropical and temperate waters worldwide, from intertidal shallow waters to deep seas of more than 6,100 m (20,000 ft). The earliest accepted sea pen fossils are known from the Cambrian-aged Burgess Shale (Thaumaptilon). Similar fossils from the Ediacaran may show the dawn of sea pens. Precisely what these early fossils are, however, is not decided.
Read on Wikipedia · Image Ernst Haeckel, Public domain
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