acorn worm

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acorn worm:

see HemichordataHemichordata
, small phylum of marine invertebrates closely related to both the echinoderms (phylum Echinodermata) and chordates (phylum Chordata). Acorn worms, class Enteropneusta, are the most common hemichordates.
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acorn worm

[′ā‚kȯrn ‚wərm]
(invertebrate zoology)
Any member of the class Enteropneusta, free-living animals that usually burrow in sand or mud. Also known as tongue worm.
References in periodicals archive ?
One of the big punchlines from my graduate work, was molecular evidence that enteropneusts and pterobranchs are closely related," said Cameron, a specialist on the taxonomy, evolution and biogeography of hemichordates.
Our findings suggest that the tubes were lost in the lineage leading to modern day enteropneusts, but elaborated on in graptolites and retained to the present day in pterobranchs," added Cameron.
Enteropneusts - or acorn worms - are marine animals closely related to starfish and sea urchins.
One of the big punchlines from my graduate work was molecular evidence that enteropneusts and pterobranchs are closely related," Cameron said.
Our colleague in California Nick Holland, the world authority on the Enteropneusts, chose the name Yoda, for the new genus characterized by its large ear-like lips.