Scenarios for the making of vertebrates.

• Autores: Nicholas D. Holland, Linda Z. Holland, Peter W.H. Holland
• Localización: Nature: International weekly journal of science, ISSN 0028-0836, Vol. 520, Nº 7548, 2015, págs. 450-455
• Idioma: inglés
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• Resumen

  • Over the past 200 years, almost every invertebrate phylum has been proposed as a starting point for evolving vertebrates. Most of these scenarios are outdated, but several are still seriously considered. The short-range transition from ancestral invertebrate chordates (similar to amphioxus and tunicates) to vertebrates is well accepted. However, longer-range transitions leading up to the invertebrate chordates themselves are more controversial. Opinion is divided between the annelid and the enteropneust scenarios, predicting, respectively, a complex or a simple ancestor for bilaterian animals. Deciding between these ideas will be facilitated by further comparative studies of multicellular animals, including enigmatic taxa such as xenacoelomorphs.