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. 2021 Mar 31;7(14):eabe7377. doi: 10.1126/sciadv.abe7377

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Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 5 — (A) Biramous limb of the Silurian chelicerate Dibasterium durgae with the exopod inserted (marked by blue color) separately and independently from the walking leg (39). (B) Modern arthropodan biramous limb with exopod inserted (marked by blue color) at the limb base of the walking leg (15). (C) Trilobite limb with gill appendage attached to both limb base ventrally (marked by blue color) and body wall dorsally by extended arthrodial membrane (purple).