Appendix S3

Ankalodous sericus, ELI-Erjie-009; light microscopy (A) and back-scatter electron imagery (B, C). (A) Entire specimen, with box indicating field shown in (B). (B) Detail of grasping array, with box indicating field shown in (C). (C) Detail of spines, showing framboidal pyritic infills of internal cavities.

Ankalodous sericus，标本编号ELI-Erjie-009；图A采用光学显微镜（light microscopy）成像，图B、C采用背散射电子成像（back-scatter electron imagery）。(A) 完整标本，图中方框指示(B)所示视野；(B) 握持阵列细节，图中方框指示(C)所示视野；(C) 棘刺细节，可见内部腔隙充填有草莓状黄铁矿充填物（framboidal pyritic infills）。