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long, slender colonial organism of the same phylum as the jellyfish. Sea pen colonies are formed by several genera of the order Pennatulacea. The colony consists of a stalk formed by an organism called a primary polyp (see polyp and medusa ) and short branches formed by secondary polyps. The stalk, embedded in sand or mud, holds the colony upright. *Sea pens differ from the closely related sea pansies and sea feathers by the form of the colony.* Sea pens are marine organisms; they are found on Atlantic and Pacific coasts in shallow to moderately deep water. Some reach a length of 2 ft (61 cm) or more. They belong in the phylum Cnidaria , class Anthozoa, order Pennatulacea.