Scenarios for the making of vertebrates

Citation:
Holland, ND, Holland LZ, Holland PWH.  2015.  Scenarios for the making of vertebrates. Nature. 520:450-455.

Date Published:

2015/04

Keywords:

animal phyla, chordate body, common origin, developing hemichordate, evolution, expression, insights, nervous-system, saccoglossus-kowalevskii, segmentation

Abstract:

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 Most of these scenarios are outdated, but several are still seriously considered.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.

Notes:

n/a

Website

DOI:

10.1038/nature14433