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https://hdl.handle.net/1959.11/17062
Title: | A new vetulicolian from Australia and its bearing on the chordate affinities of an enigmatic Cambrian group. | Contributor(s): | Garcia-Bellido, Diego C (author); Lee, Michael S Y (author); Edgecombe, Gregory D (author); Jago, James B (author); Gehling, James G (author); Paterson, John R (author) | Publication Date: | 2014 | Open Access: | Yes | DOI: | 10.1186/s12862-014-0214-z | Handle Link: | https://hdl.handle.net/1959.11/17062 | Abstract: | Background: Vetulicolians are one of the most problematic and controversial Cambrian fossil groups, having been considered as arthropods, chordates, kinorhynchs, or their own phylum. Mounting evidence suggests that vetulicolians are deuterostomes, but affinities to crown-group phyla are unresolved. Results: A new vetulicolian from the Emu Bay Shale Konservat-Lagerstätte, South Australia, 'Nesonektris aldridgei' gen. et sp. nov., preserves an axial, rod-like structure in the posterior body region that resembles a notochord in its morphology and taphonomy, with notable similarity to early decay stages of the notochord of extant cephalochordates and vertebrates. Some of its features are also consistent with other structures, such as a gut or a coelomic cavity. Conclusions: Phylogenetic analyses resolve a monophyletic Vetulicolia as sister-group to tunicates (Urochordata) within crown Chordata, and this holds even if they are scored as unknown for all notochord characters. The hypothesis that the free-swimming vetulicolians are the nearest relatives of tunicates suggests that a perpetual free-living life cycle was primitive for tunicates. Characters of the common ancestor of Vetulicolia + Tunicata include distinct anterior and posterior body regions - the former being non-fusiform and used for filter feeding and the latter originally segmented - plus a terminal mouth, absence of pharyngeal bars, the notochord restricted to the posterior body region, and the gut extending to the end of the tail. | Publication Type: | Journal Article | Grant Details: | ARC/FT120100770 | Source of Publication: | BMC Evolutionary Biology, v.14, p. 1-13 | Publisher: | BioMed Central Ltd | Place of Publication: | United Kingdom | ISSN: | 1471-2148 | Fields of Research (FoR) 2008: | 060309 Phylogeny and Comparative Analysis 060301 Animal Systematics and Taxonomy 040308 Palaeontology (incl Palynology) |
Fields of Research (FoR) 2020: | 310410 Phylogeny and comparative analysis 310401 Animal systematics and taxonomy 370506 Palaeontology (incl. palynology) |
Socio-Economic Objective (SEO) 2008: | 970104 Expanding Knowledge in the Earth Sciences 970106 Expanding Knowledge in the Biological Sciences |
Socio-Economic Objective (SEO) 2020: | 280107 Expanding knowledge in the earth sciences 280102 Expanding knowledge in the biological sciences |
Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
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Appears in Collections: | Journal Article |
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