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Title: A new leanchoiliid megacheiran arthropod from the lower Cambrian Emu Bay Shale, South Australia
Contributor(s): Edgecombe, GD (author); Garcia-Bellido, DC (author); Paterson, John R  (author)orcid 
Publication Date: 2011
Open Access: Yes
DOI: 10.4202/app.2010.0080Open Access Link
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Abstract: The Leanchoiliidae is well-known from abundant material of 'Leanchoilia', from the Burgess Shale and Chengjiang Konservat-Lagerstätten. The first Australian member of the group is 'Oestokerkus megacholix' gen. et sp. nov., described from the Emu Bay Shale (Cambrian Series 2, Stage 4), at Buck Quarry, Kangaroo Island, South Australia, and is intermediate in age between the well known leanchoiliid species from the Burgess Shale and Chengjiang. Phylogenetic analysis of "short great appendage" arthropods (Megacheira) in the context of the chelicerate stem group resolves the Australian species as sister to Burgess Shale, Utah, and Chengjiang 'Leanchoilia' species, but most readily distinguished from 'Leanchoilia' and 'Alalcomenaeus' by a different telson shape, interpreted as being forked, widening distally, and with a few dorsally curved spines at the posterior angle. Leanchoiliid interrelationships are stable to alternative character weights, and Megacheira corresponds to a clade in most analyses.
Publication Type: Journal Article
Source of Publication: Acta Palaeontologica Polonica, 56(2), p. 385-400
Publisher: Polska Akademia Nauk, Instytut Paleobiologii
Place of Publication: Poland
ISSN: 1732-2421
Field of Research (FOR): 060301 Animal Systematics and Taxonomy
040308 Palaeontology (incl Palynology)
060309 Phylogeny and Comparative Analysis
Socio-Economic Outcome Codes: 970104 Expanding Knowledge in the Earth Sciences
970106 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
School of Environmental and Rural Science

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