Appendix S1. A, Hercolepas signata NRM Ec 6108, from the Vattenfallet section, Gotland, Sweden. B, detail of sclerites with large radiating spines and smaller interfingering sclerites. C, Protobalanus hamiltonensis from the Hamilton group, New York and D, Another specimen on the same slab AMNH 22866, Scale bars: A, 5 mm; B, 1 mm; C and D, 3 mm. (John S. Peel kindly provided the dimensions of H. signata)

Appendix S2. Movie file of P. spinicoronatus based on a microCT scan. Showing the specimen before and after segmentation and the sequential articulation of the specimen.

PALA_1180_sm_AppendixS1.jpg1493KSupporting info item
PALA_1180_sm_AppendixS2.wmv11841KSupporting info item

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