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Type: Journal article
Title: A new leanchoiliid megacheiran arthropod from the lower Cambrian Emu Bay Shale, South Australia
Author: Edgecombe, G.
Garcia-Bellido, D.
Paterson, J.
Citation: Acta Palaeontologica Polonica, 2011; 56(2):385-400
Publisher: Instytut Paleobiologii Pan
Issue Date: 2011
ISSN: 0567-7920
Statement of
Gregory D. Edgecombe, Diego C. García-Bellido, and John R. Paterson
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.
Keywords: Arthropoda; Megacheira; Leanchoiliidae; Oestokerkus; Leanchoilia; Alalcomenaeus; midgut glands; phylogeny; Cambrian; South Australia
Rights: Copyright status unknown
RMID: 0020128696
DOI: 10.4202/app.2010.0080
Grant ID:
Appears in Collections:Ecology, Evolution and Landscape Science publications

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