A superarmored lobopodian from the Cambrian of China and early disparity in the evolution of Onychophora

Yang, Jie and Ortega-Hernández, Javier and Gerber, Sylvain and Butterfield, Nicholas J. and Hou, Jin-bo and Lan, Tian and Zhang, Xi-guang (2015) A superarmored lobopodian from the Cambrian of China and early disparity in the evolution of Onychophora. Proceedings of the National Academy of Sciences of the United States of America, 112 (28). pp. 8678-8683. ISSN 0027-8424 Online ISSN 1091-6490 DOI 10.1073/pnas.1505596112

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Official URL: http://www.pnas.org/content/early/2015/06/24/15055...

Abstract

We describe Collinsium ciliosum from the early Cambrian Xiaoshiba Lagerstätte in South China, an armored lobopodian with a remarkable degree of limb differentiation including a pair of antenna-like appendages, six pairs of elongate setiferous limbs for suspension feeding, and nine pairs of clawed annulated legs with an anchoring function. Collinsium belongs to a highly derived clade of lobopodians within stem group Onychophora, distinguished by a substantial dorsal armature of supernumerary and biomineralized spines (Family Luolishaniidae). As demonstrated here, luolishaniids display the highest degree of limb specialization among Paleozoic lobopodians, constitute more than one-third of the overall morphological disparity of stem group Onychophora, and are substantially more disparate than crown group representatives. Despite having higher disparity and appendage complexity than other lobopodians and extant velvet worms, the specialized mode of life embodied by luolishaniids became extinct during the Early Paleozoic. Collinsium and other superarmored lobopodians exploited a unique paleoecological niche during the Cambrian explosion.

Item Type: Article
Uncontrolled Keywords: 2015AREP; IA69;
Subjects: 04 - Palaeobiology
Divisions: 04 - Palaeobiology
Journal or Publication Title: Proceedings of the National Academy of Sciences of the United States of America
Volume: 112
Page Range: pp. 8678-8683
Identification Number: 10.1073/pnas.1505596112
Depositing User: Sarah Humbert
Date Deposited: 14 Aug 2015 16:16
Last Modified: 25 Aug 2015 15:00
URI: http://eprints.esc.cam.ac.uk/id/eprint/3419

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