Modern Antarctic acorn worms form tubes

Kenneth M. Halanych (), Johanna T. Cannon, Andrew R. Mahon, Billie J. Swalla and Craig R. Smith
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Kenneth M. Halanych: Auburn University, 101 Rouse Life Sciences
Johanna T. Cannon: Auburn University, 101 Rouse Life Sciences
Andrew R. Mahon: Institute for Great Lakes Research, Central Michigan University
Billie J. Swalla: University of Washington
Craig R. Smith: University of Hawaii at Manoa

Nature Communications, 2013, vol. 4, issue 1, 1-4

Abstract: Abstract Acorn worms, or enteropneusts, are vermiform hemichordates that occupy an important position in deuterostome phylogeny. Allied to pterobranch hemichordates, small colonial tube dwellers, modern enteropneusts were thought to be tubeless. However, understanding of hemichordate diversity is poor, as evidenced by absence of reports from some oceanic regions and recent descriptions of large epibenthic deep-water enteropneusts, Torquaratoridae. Here we show, based on expeditions to Antarctica, that some acorn worms produce conspicuous tubes that persist for days. Interestingly, recent fossil descriptions show a Middle Cambrian acorn worm lived in tubes, leading to speculation that these fossils may have been pterobranch forbearers. Our discovery provides the alternative interpretation that these fossils are similar to modern-day torquaratorids and that some behaviours have been conserved for over 500 million years. Moreover, the frequency of Antarctic enteropneusts observed attests to our limited knowledge of Antarctic marine ecosystems, and strengthens hypotheses relating more northern deep-sea fauna to Antarctic shelf fauna.

Date: 2013
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DOI: 10.1038/ncomms3738

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