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. 1994 Mar 1;91(5):1801–1804. doi: 10.1073/pnas.91.5.1801

Details of the evolutionary history from invertebrates to vertebrates, as deduced from the sequences of 18S rDNA.

H Wada 1, N Satoh 1
PMCID: PMC43251  PMID: 8127885

Abstract

Almost the entire sequences of 18S rDNA were determined for two chaetognaths, five echinoderms, a hemichordate, and two urochordates (a larvacean and a salp). Phylogenetic comparisons of the sequences, together with those of other deuterostomes (an ascidian, a cephalochordate, and vertebrates) and protostomes (an arthropod and a mollusc), suggest the monophyly of the deuterostomes, with the exception of the chaetognaths. Chaetognaths may not be a group of deuterostomes. The deuterostome group closest to vertebrates was the group of cephalochordates. Ascidians, larvaceans, and salps seem to form a discrete group (urochordates), in which the early divergence of larvaceans is evident. These results support the hypothesis that chordates evolved from free-living ancestors.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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