Journal
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
Volume 277, Issue 1679, Pages 165-174Publisher
ROYAL SOC
DOI: 10.1098/rspb.2009.0646
Keywords
Chengjiang; deuterostomes; yunnanozoans; vetulicolians; Cambrian; metazoan evolution
Categories
Funding
- Natural Science Foundation of China [40830208, 40332016, 40602003, 40702003]
- State Key Laboratory of Continental Dynamics in Northwest University
- Ministry of Science and Technology of China [2006CB806401]
- Cowper-Reed Fund
- St John's College, Cambridge in the UK
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While the broad framework of deuterostome evolution is now clear, the remarkable diversity of extant forms within this group has rendered the nature of the ancestral types problematic: what, for example, does the common ancestor of a sea urchin and lamprey actually look like? The answer to such questions can be addressed on the basis of remarkably well-preserved fossils from Cambrian Lagerstatten, not least the celebrated Chengjiang Lagerstatte (Yunnan, China). This deposit is particularly important because of its rich diversity of deuterostomes. These include some of the earliest known representatives, among which are the first vertebrates, as well as more enigmatic groups, notably the vetulicolians and yunnanozoans. The latter groups, in particular, have been the subject of some radical divergences in opinion as to their exact phylogenetic placements. Here, we both review the known diversity of Chengjiang deuterostomes and in particular argue that the vetulicolians and yunnanozoans represent very primitive deuterostomes. Moreover, in the latter case we present new data to indicate that the yunnanozoans are unlikely to be any sort of chordate.
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