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Science 20 November 1992:
Vol. 258. no. 5086, pp. 1345 - 1348
DOI: 10.1126/science.1455227
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Articles

Science, Vol 258, Issue 5086, 1345-1348
Copyright © 1992 by American Association for the Advancement of Science

articles

Evidence from 12S ribosomal RNA sequences that onychophorans are modified arthropods

JW Ballard, GJ Olsen, DP Faith, WA Odgers, DM Rowell, and PW Atkinson

Division of Entomology, CSIRO, Canberra, Australia.

The evolutionary relationships of the onychophorans (velvet worms) and the monophyly of the arthropods have generated considerable debate. Cladistic analyses of 12S ribosomal RNA sequences indicate that arthropods are monophyletic and include the onychophorans. Maximum parsimony analyses and monophyly testing within arthropods indicate that myriapods (millipedes and centipedes) form a sister group to all other assemblages, whereas crustaceans (shrimps and lobsters) plus hexapods (insects and allied groups) form a well-supported monophyletic group. Parsimony analysis further suggests that onychophorans form a sister group to chelicerates (spiders and scorpions) and crustaceans plus hexapods, but this relationship is not well supported by monophyly testing. These relationships conflict with current hypotheses of evolutionary pathways within arthropods.


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