Correction to: Mandibulate convergence in an armoured Cambrian stem chelicerate

Correction to: Mandibulate convergence in an armoured Cambrian stem chelicerate Aria and Caron BMC Evolutionary Biology (2018) 18:78 https://doi.org/10.1186/s12862-018-1189-y CORRECTION Open Access Correction to: Mandibulate convergence in an armoured Cambrian stem chelicerate 1* 2 Cédric Aria and Jean-Bernard Caron Correction ○ Correct: In this study, we thoroughly The original article [1] had 4 paragraphs which con- reinvestigated the Burgess Shale euarthropod tained erroneous information. In this correction article Habelia optata Walcott, 1912 based on Walcott’s the correct and incorrect information is shown. original material and new specimens discovered by the Royal Ontario Museum. H. optata was initially – Page 2 regarded by Walcott as an “aglaspidid merostome,” ○ Incorrect: In this study, we thoroughly which would hint at a chelicerate affinity [36], but reinvestigated the Burgess Shale euarthropod this statement lacked much justification [37]. Habelia Walcott, 1912 based on Walcott’s original Simonetta [38] and Simonetta and Delle Cave [39] material and new specimens discovered by the followed this view based mostly on overall aspect, Royal Ontario Museum. Habelia optata was while preferring to compare H. brevicauda, the initially regarded by Walcott as an “aglaspidid new species erected by Simonetta, to Leanchoilia merostome,” which would hint at a chelicerate [39]—a megacheiran. Importantly, early authors affinity [36], but this statement lacked much [37–41] recognized the presence of at least five justification [37]. Simonetta [38] and Simonetta pairs of head appendages, a condition that could and Delle Cave [39] followed this view based have later related this animal to Sanctacaris—even mostly on overall aspect, while preferring to if an interpretation of strictly five pairs and some compare H. brevicauda, the new morphotype other morphological details led to comparisons erected by Simonetta, to Leanchoilia [39]—a with crustaceans instead [40, 42]. In his revision of megacheiran. Importantly, early authors [37–41] the species, however, Whittington [43] rejected recognized the presence of at least five pairs of previous interpretations of a cephalon with five head appendages, a condition that could have later head appendages or more, leaving H. optata as a related this animal to Sanctacaris—even if an problematicum. Herafter, we reevaluate the interpretation of strictly five pairs and some other significance of H. optata [...] morphological details led to comparisons with – Page 3 crustaceans instead [40, 42]. In his revision of the ○ Incorrect: Abbreviations used in figures… genus, however, Whittington [43] rejected ○ Correct: Abbreviations used in figures and previous interpretations of a cephalon with five additional files… head appendages or more, leaving Habelia as a – Page 3 problematicum. Herafter, we reevaluate the ○ Incorrect: Abbreviations used in figures: ag, significance of Habelia for the early evolution of anterior gnathobase; am, arthrodial membrane; an, chelicerates, as well as for the understanding of anus; ap, anal pouch; att, endopod attachment on morphological convergence in the ecological gnathobase; bas, basipod(s); ce, cephalic context of the radiation of Cambrian endopod(s); cen, cephalic endopod n; cel, left euarthropods. cephalic exopods; cpl, cephalic pleura; cx, cephalic exopod(s); cxn, cephalic exopod n; db, distal brush; dpex, distal part of exopod; ds, dorsal spine; dtp; distal telson piece; e, eye; en, endopod n; en, * Correspondence: cedric.aria@protonmail.com 1 endopod; ex, exopod; das, dark stain; Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Canada Full list of author information is available at the end of the article © The Author(s). 2018 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. Aria and Caron BMC Evolutionary Biology (2018) 18:78 Page 2 of 2 ○ Correct: Abbreviations used in figures: ag, anterior gnathobase; am, arthrodial membrane; an, anus; ap, anal pouch; att, endopod attachment on gnathobase; bas, basipod(s); ce, cephalic endopod(s); cen, cephalic endopod n; cel, left cephalic exopods; cpl, cephalic pleura; cx, cephalic exopod(s); cxn, cephalic exopod n; das, dark stain; db, distal brush; dpex, distal part of exopod; ds, dorsal spine; dtp; distal telson piece; e, eye; en, endopod n; en, endopod; ex, exopod; – Page 4 ○ Incorrect: “however, the presence of eight post-cephalic tergites and a pygidium would rather seem to indicate a relationship with Mollisonia” ○ Correct: “however, the presence of seven post- cephalic tergites and a pygidium would rather seem to indicate a relationship with Mollisonia” Author details Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Canada. Present address: State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China. Received: 22 December 2017 Accepted: 22 December 2017 Reference 1. Aria C,CaronJ-B.Mandibulate convergenceinanarmouredCambrianstem chelicerate. BMC Evol Biol. 2017;17:261. https://doi.org/10.1186/s12862-017-1088-7. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png BMC Evolutionary Biology Springer Journals

Correction to: Mandibulate convergence in an armoured Cambrian stem chelicerate

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Life Sciences; Evolutionary Biology; Animal Systematics/Taxonomy/Biogeography; Entomology; Genetics and Population Dynamics; Life Sciences, general
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Aria and Caron BMC Evolutionary Biology (2018) 18:78 https://doi.org/10.1186/s12862-018-1189-y CORRECTION Open Access Correction to: Mandibulate convergence in an armoured Cambrian stem chelicerate 1* 2 Cédric Aria and Jean-Bernard Caron Correction ○ Correct: In this study, we thoroughly The original article [1] had 4 paragraphs which con- reinvestigated the Burgess Shale euarthropod tained erroneous information. In this correction article Habelia optata Walcott, 1912 based on Walcott’s the correct and incorrect information is shown. original material and new specimens discovered by the Royal Ontario Museum. H. optata was initially – Page 2 regarded by Walcott as an “aglaspidid merostome,” ○ Incorrect: In this study, we thoroughly which would hint at a chelicerate affinity [36], but reinvestigated the Burgess Shale euarthropod this statement lacked much justification [37]. Habelia Walcott, 1912 based on Walcott’s original Simonetta [38] and Simonetta and Delle Cave [39] material and new specimens discovered by the followed this view based mostly on overall aspect, Royal Ontario Museum. Habelia optata was while preferring to compare H. brevicauda, the initially regarded by Walcott as an “aglaspidid new species erected by Simonetta, to Leanchoilia merostome,” which would hint at a chelicerate [39]—a megacheiran. Importantly, early authors affinity [36], but this statement lacked much [37–41] recognized the presence of at least five justification [37]. Simonetta [38] and Simonetta pairs of head appendages, a condition that could and Delle Cave [39] followed this view based have later related this animal to Sanctacaris—even mostly on overall aspect, while preferring to if an interpretation of strictly five pairs and some compare H. brevicauda, the new morphotype other morphological details led to comparisons erected by Simonetta, to Leanchoilia [39]—a with crustaceans instead [40, 42]. In his revision of megacheiran. Importantly, early authors [37–41] the species, however, Whittington [43] rejected recognized the presence of at least five pairs of previous interpretations of a cephalon with five head appendages, a condition that could have later head appendages or more, leaving H. optata as a related this animal to Sanctacaris—even if an problematicum. Herafter, we reevaluate the interpretation of strictly five pairs and some other significance of H. optata [...] morphological details led to comparisons with – Page 3 crustaceans instead [40, 42]. In his revision of the ○ Incorrect: Abbreviations used in figures… genus, however, Whittington [43] rejected ○ Correct: Abbreviations used in figures and previous interpretations of a cephalon with five additional files… head appendages or more, leaving Habelia as a – Page 3 problematicum. Herafter, we reevaluate the ○ Incorrect: Abbreviations used in figures: ag, significance of Habelia for the early evolution of anterior gnathobase; am, arthrodial membrane; an, chelicerates, as well as for the understanding of anus; ap, anal pouch; att, endopod attachment on morphological convergence in the ecological gnathobase; bas, basipod(s); ce, cephalic context of the radiation of Cambrian endopod(s); cen, cephalic endopod n; cel, left euarthropods. cephalic exopods; cpl, cephalic pleura; cx, cephalic exopod(s); cxn, cephalic exopod n; db, distal brush; dpex, distal part of exopod; ds, dorsal spine; dtp; distal telson piece; e, eye; en, endopod n; en, * Correspondence: cedric.aria@protonmail.com 1 endopod; ex, exopod; das, dark stain; Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Canada Full list of author information is available at the end of the article © The Author(s). 2018 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. Aria and Caron BMC Evolutionary Biology (2018) 18:78 Page 2 of 2 ○ Correct: Abbreviations used in figures: ag, anterior gnathobase; am, arthrodial membrane; an, anus; ap, anal pouch; att, endopod attachment on gnathobase; bas, basipod(s); ce, cephalic endopod(s); cen, cephalic endopod n; cel, left cephalic exopods; cpl, cephalic pleura; cx, cephalic exopod(s); cxn, cephalic exopod n; das, dark stain; db, distal brush; dpex, distal part of exopod; ds, dorsal spine; dtp; distal telson piece; e, eye; en, endopod n; en, endopod; ex, exopod; – Page 4 ○ Incorrect: “however, the presence of eight post-cephalic tergites and a pygidium would rather seem to indicate a relationship with Mollisonia” ○ Correct: “however, the presence of seven post- cephalic tergites and a pygidium would rather seem to indicate a relationship with Mollisonia” Author details Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Canada. Present address: State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China. Received: 22 December 2017 Accepted: 22 December 2017 Reference 1. Aria C,CaronJ-B.Mandibulate convergenceinanarmouredCambrianstem chelicerate. BMC Evol Biol. 2017;17:261. https://doi.org/10.1186/s12862-017-1088-7.

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BMC Evolutionary BiologySpringer Journals

Published: May 29, 2018

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