Words similar to arthropods
Example sentences for: arthropods
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The traditional view is that arthropods are more closely related to annelids than to nematodes, but some recent molecular phylogenies place nematodes and arthropods together in a high-level taxon named Ecdysozoa, which does not include annelids [ 24 25 ] . Other molecular studies give conflicting results [ 26 27 ] . Regardless of the evolutionary relationship between Nematoda and Arthropoda, C. elegans and Drosophila remain useful and valid models for our analyses, and the relationships shown in Figure 1are consistent with both hypotheses.
Although it is possible that a basal position of nematodes is the result of some unknown and widespread bias not yet identified, a simpler explanation is that the grouping of nematodes with arthropods is an artifact that arose from the analysis of a single gene, 18S rRNA.
This tree is based mainly on information from Maddison's "Tree of Life" project http://tolweb.org/tree/phylogeny.html, NCBI's taxonomy database http://www.ncbi.nlm.nih.gov/Taxonomy/taxonomyhome.html, the "Deep Green" project http://ucjeps.berkeley.edu/bryolab/greenplantpage.html, and [ 29 30 31 32 ] . This master tree groups nematodes and arthropods into a clade of ecdysozoans (molting animals) as proposed by Aguinaldo [ 29 ] , a classification which is still controversial.
In analyses of the 18S rRNA gene, nematodes typically appear basal to arthropods + vertebrates.
The three possible relationships of these animal phyla are: (I) arthropods + vertebrates, (II) arthropods + nematodes, and (III) nematodes + vertebrates.
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