Anomalocaridid trunk limb homology revealed by a giant filter-feeder with paired flaps

Nature
Peter Van RoyDerek E G Briggs

Abstract

Exceptionally preserved fossils from the Palaeozoic era provide crucial insights into arthropod evolution, with recent discoveries bringing phylogeny and character homology into sharp focus. Integral to such studies are anomalocaridids, a clade of stem arthropods whose remarkable morphology illuminates early arthropod relationships and Cambrian ecology. Although recent work has focused on the anomalocaridid head, the nature of their trunk has been debated widely. Here we describe new anomalocaridid specimens from the Early Ordovician Fezouata Biota of Morocco, which not only show well-preserved head appendages providing key ecological data, but also elucidate the nature of anomalocaridid trunk flaps, resolving their homology with arthropod trunk limbs. The new material shows that each trunk segment bears a separate dorsal and ventral pair of flaps, with a series of setal blades attached at the base of the dorsal flaps. Comparisons with other stem lineage arthropods indicate that anomalocaridid ventral flaps are homologous with lobopodous walking limbs and the endopod of the euarthropod biramous limb, whereas the dorsal flaps and associated setal blades are homologous with the flaps of gilled lobopodians (for example, Kerygmache...Continue Reading

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Citations

Jan 24, 2016·Arthropod Structure & Development·Javier Ortega-Hernández, Graham E Budd
Oct 7, 2015·Current Biology : CB·Derek E G Briggs
Dec 19, 2015·BMC Evolutionary Biology·Ariel D Chipman
Nov 21, 2015·Biological Reviews of the Cambridge Philosophical Society·Graham E Budd, Sören Jensen
Aug 16, 2015·Arthropod Structure & Development·Nicholas J StrausfeldXianguang Hou
May 12, 2015·Current Biology : CB·Javier Ortega-Hernández
Jun 17, 2015·Current Biology : CB·Gregory D Edgecombe
Dec 19, 2016·Arthropod Structure & Development·Javier Ortega-HernándezGraham E Budd
Jan 16, 2016·PloS One·Geerat J Vermeij
Sep 29, 2017·Integrative and Comparative Biology·Elizabeth L Jockusch
Oct 3, 2019·Proceedings. Biological Sciences·Ariel D Chipman, Gregory D Edgecombe
Dec 12, 2019·Proceedings. Biological Sciences·Javier Ortega-HernándezStephen Pates
Jun 19, 2019·Zoological Letters·Stephen PatesNicholas J Butterfield
May 23, 2018·Proceedings of the National Academy of Sciences of the United States of America·Allison C DaleyStephen Pates
Mar 3, 2020·PeerJ·Russell D C Bicknell, Stephen Pates
Jun 17, 2020·Royal Society Open Science·Samuel J CoathamChristian Klug
Sep 16, 2018·Nature Communications·Rudy Lerosey-Aubril, Stephen Pates
May 16, 2018·Ecology and Evolution·John S S Denton, Eric W Goolsby
Aug 4, 2020·Royal Society Open Science·Stephen PatesLucy A Muir
Jan 10, 2020·BMC Evolutionary Biology·Cédric AriaMaoyan Zhu
Apr 2, 2021·Science Advances·Jin-Bo HouMelanie J Hopkins
Apr 17, 2021·Arthropod Structure & Development·Graham E Budd
Jun 24, 2021·Proceedings. Biological Sciences·Stephen PatesImran A Rahman
Jul 22, 2021·Proceedings. Biological Sciences·Giacinto De VivoJakob Vinther

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