Publication Date:
1992-11-20
Description:
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.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ballard, J W -- Olsen, G J -- Faith, D P -- Odgers, W A -- Rowell, D M -- Atkinson, P W -- New York, N.Y. -- Science. 1992 Nov 20;258(5086):1345-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Entomology, CSIRO, Canberra, Australia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1455227" target="_blank"〉PubMed〈/a〉
Keywords:
Animals
;
Base Sequence
;
DNA, Mitochondrial/*genetics
;
Humans
;
Invertebrates/*genetics
;
Molecular Sequence Data
;
Phylogeny
;
RNA, Ribosomal/*genetics
;
Sequence Homology, Nucleic Acid
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
Permalink
