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acorn worm
(redirected from acorn worms)

    Also found in: Encyclopedia, Wikipedia, Hutchinson 0.04 sec.
acorn worm
n.
Any of a class (Enteropneusta) of hemichordate, wormlike animals that inhabit shallow burrows in mud or sand flats of intertidal zones and are equipped with an acornlike proboscis used for digging and collecting food.
acorn worm
n
(Life Sciences & Allied Applications / Animals) 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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In preliminary studies, Shu Degan of Xian Northwest University places Yunnanozoon in another phylum, the hemichordates, which includes the modern acorn worms.
Jump-start for the vertebrates; new clues to how our ancestors got a ... by Monastersky, Ronald / Science News
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