The Lobopod Onychodictyon from the Lower Cambrian Chengjiang Lagerstätte Revisited

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The lobopod Onychodictyon from the Lower Cambrian Chengjiang Lagerstätte revisited Jianni Liu, Degan Shu, Jian Han, Zhifei Zhang, and Xingliang Zhang Acta Palaeontologica Polonica 53 (2), 2008: 285-292 doi:http://dx.doi.org/10.4202/app.2008.0209 Onychodictyon ferox, from the Lower Cambrian Chengjiang Lagerstätte, is a worm−like armored lobopod with 10 pairs of dorsal plates and a pair of probable sensory appendages (“antennae”). Newly discovered complete specimens show that Onychodictyon is represented by two species: O. ferox with a “head” bearing a pair of dorsal “antennae” and a trunk with 11 pairs of limbs, whereas O. gracilis has a blunt anterior end without any appendages and a trunk with 12 pairs of limbs. Because of the close resemblance of the “antennae” of O. ferox and those of the lobopod Miraluolishania, they are considered to be homologous structures. The “antennae” of Cambrian lobopodians are proposed to be homologous with the arthropod antennulae. Key words: Lobopodia, Arthropoda, antennae, Cambrian, Chengjiang Lagerstätte, Yunnan Jianni Liu [[email protected]], Jian Han [[email protected]], Zhifei Zhang [[email protected] ], and Xingliang Zhang [[email protected]], Early Life Institute and Key Laboratory for Continental Dynamics of the Ministry Education, Northwest University, Xi’an, 710069, China; Degan Shu [[email protected]], Early Life Institute and Department of Geology, Northwest University, Xi’an, 710069, China, School of Earth Sciences and Resources, China University of Geosciences (Beijing), 100083, China. This is an open-access article distributed under the terms of the Creative Commons Attribution License (for details please see creativecommons.org), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Full text (1,049.3 kB) Powered by TCPDF (www.tcpdf.org).

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Priapulida Priapulida Aysheaia A Paucipodia B Siberion Microdictyon Tardigrada Diania Antennacanthopodia Antennacanthopodia Onychophora Aysheaia Diania Xenusion Paucipodia Hadranax Microdictyon 100 Orstenotubulus Hadranax Siberion Orstenotubulus Onychophora Xenusion Tardigrada Cardiodictyon Cardiodictyon Hallucigenia Onychodictyon Onychodictyon 55 Hallucigenia Collins’ monster 88 Luolishania Luolishania Collins’ monster Megadictyon Megadictyon Jianshanopodia Jianshanopodia Pambdelurion 65 Kerygmachela Kerygmachela Pambdelurion Anomalocaris 62 62 Opabinia Opabinia Anomalocaris Schinderhannes 83 Schinderhannes Fuxianhuia Fuxianhuia 88 Eoredlichia Eoredlichia 74 Leanchoilia 0.2 changes / character 74 Leanchoilia Tubiluchus (Priapulida) Tubiluchus (Priapulida) Cricocosmia C Cricocosmia D Aysheaia Aysheaia Siberion Onychodictyon gracilis Onychodictyon gracilis Diania Hadranax Xenusion 100 61 Megadictyon Paucipodia Jianshanopodia Microdictyon Onychodictyon ferox Cardiodictyon Siberian Orsten tardigrade Hallucigenia fortis 95 60 93 64 Actinarctus (Heterotardigrada) Hallucigenia sparsa Halobiotus (Eutardigrada) Carbotubulus Kerygmachela Hallucigenia hongmeia Pambdelurion Collins’ monster Emu Bay 64 Opabinia Luolishania 90 Anomalocaris Antennacanthopodia Peytoia Ilyodes 96 69 Hurdia Euperipatoides (Onychophora) 83 Fuxianhuia 50 Chengjiangocaris Onychodictyon ferox 67 Misszhouia Siberian Orsten tardigrade 100 Kuamaia Halobiotus (Eutardigrada) Supella (Hexapoda) Actinarctus (Heterotardigrada) 81 58 Leanchoilia Hadranax 89 Alalcomenaeus Siberion Paucipodia
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