Acorn worm

any of several burrowing, often brilliantly colored hemichordates of the cl-ss enteropneusta, usually found in intertidal sand and mud, having an acorn-shaped proboscis and collar.
any of various small burrowing marine animals of the genus balanoglossus and related genera, having an elongated wormlike body with an acorn-shaped eversible proboscis at the head end: subphylum hemichordata (hemichordates)

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