A Tube-Dwelling Early Cambrian Lobopodian
dc.contributor.author | Howard, RJ | |
dc.contributor.author | Hou, X | |
dc.contributor.author | Edgecombe, GD | |
dc.contributor.author | Salge, T | |
dc.contributor.author | Shi, X | |
dc.contributor.author | Ma, X | |
dc.date.accessioned | 2021-01-19T09:12:28Z | |
dc.date.issued | 2020-02-27 | |
dc.description.abstract | Facivermis yunnanicus [1, 2] is an enigmatic worm-like animal from the early Cambrian Chengjiang Biota of Yunnan Province, China. It is a small (<10 cm) bilaterian with five pairs of spiny anterior arms, an elongated body, and a swollen posterior end. The unusual morphology of Facivermis has prompted a history of diverse taxonomic interpretations, including among annelids [1, 3], lophophorates [4], and pentastomids [5]. However, in other studies, Facivermis is considered to be more similar to lobopodians [2, 6–8]—the fossil grade from which modern panarthropods (arthropods, onychophorans, and tardigrades) are derived. In these studies, Facivermis is thought to be intermediate between cycloneuralian worms and lobopodians. Facivermis has therefore been suggested to represent an early endobenthic-epibenthic panarthropod transition [6] and to provide crucial insights into the origin of paired appendages [2]. However, the systematic affinity of Facivermis was poorly supported in a previous phylogeny [6], partially due to incomplete understanding of its morphology. Therefore, the evolutionary significance of Facivermis remains unresolved. In this study, we re-examine Facivermis from new material and the holotype, leading to the discovery of several new morphological features, such as paired eyes on the head and a dwelling tube. Comprehensive phylogenetic analyses using parsimony, Bayesian inference, and maximum likelihood all support Facivermis as a luolishaniid in a derived position within the onychophoran stem group rather than as a basal panarthropod. In contrast to previous studies, we therefore conclude that Facivermis provides a rare early Cambrian example of secondary loss to accommodate a highly specialized tube-dwelling lifestyle. Facivermis is an enigmatic worm from the early Cambrian Chengjiang Biota. Here, Howard et al. identify Facivermis as a tube-dwelling lobopodian and demonstrate that its worm-like appearance was a secondary adaptation. This shows that Facivermis was not a basal, ancestrally worm-like panarthropod, as some studies suggest. | en_GB |
dc.description.sponsorship | Thousand Youth Talents Plan of China | en_GB |
dc.description.sponsorship | Yunnan provincial research grant | en_GB |
dc.description.sponsorship | Chinese Academy of Sciences | en_GB |
dc.description.sponsorship | Natural Environment Research Council (NERC) | en_GB |
dc.identifier.citation | Vol. 30 (8), pp. 1529 - 1536.e2 | en_GB |
dc.identifier.doi | 10.1016/j.cub.2020.01.075 | |
dc.identifier.grantnumber | 2015HA021 | en_GB |
dc.identifier.grantnumber | 2015HC029 | en_GB |
dc.identifier.grantnumber | XDB26000000 | en_GB |
dc.identifier.grantnumber | NE/L011751/1 | en_GB |
dc.identifier.uri | http://hdl.handle.net/10871/124429 | |
dc.language.iso | en | en_GB |
dc.publisher | Elsevier | en_GB |
dc.rights | © 2020 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). | en_GB |
dc.title | A Tube-Dwelling Early Cambrian Lobopodian | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2021-01-19T09:12:28Z | |
dc.identifier.issn | 0960-9822 | |
dc.description | This is the final version. Available on open access from Elsevier via the DOI in this record | en_GB |
dc.description | Data and Code Availability: The phylogenetic dataset compiled for this study is included (Data S1B), and no other datasets or code were analyzed. | en_GB |
dc.identifier.journal | Current Biology | en_GB |
dc.rights.uri | https://creativecommons.org/licenses/by-nc-nd/4.0/ | en_GB |
dcterms.dateAccepted | 2020-01-24 | |
rioxxterms.version | VoR | en_GB |
rioxxterms.licenseref.startdate | 2020-02-27 | |
rioxxterms.type | Journal Article/Review | en_GB |
refterms.dateFCD | 2021-01-19T09:09:25Z | |
refterms.versionFCD | VoR | |
refterms.dateFOA | 2021-01-19T09:12:32Z | |
refterms.panel | A | en_GB |
refterms.depositException | publishedGoldOA |
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Except where otherwise noted, this item's licence is described as © 2020 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).