English: Sanctacaris uncata Briggs and Collins, Holotype ROMIP 43502. Part (A) and partial counterpart (B) both discovered in 1983 - lower weathered portion of the counterpart never before published was discovered in 2007. (A) Full specimen, preserved in dorsal aspect. Insets as indicated. (B) Full specimen, counterpart. Inset is (C). (C) Close-up of anterior region of prosoma. Inset is (I). (D) Specimen photographed in direct light after coating in ammonium chloride sublimate. Arrowheads point to small dorsal carinae on trunk tergites. (E) Close-up of anterior trunk appendages on right side of body, possibly the corresponding exopods of (F) with setae not preserved. (F) Close-up of exopod of first and second trunk appendages. (G) Close-up of cephalic appendages posterior to raptorial “bundle,” showing paddle-like exopod interpreted as belonging to the intermediary appendage, and small appendage with distal setal brush of unclear identity. (H) Close-up on first cephalic endopod, showing five well-developed endites on inner margins of podomeres, and possibly an additional one proximally. (I) Close-up of frontalmost region, showing morphology of cephalic endopods 1–3. Endites indicated by asterisks. Ventral face of labrum revealing bipartite frontal morphology (demarcation pointed by arrow) with paired reflective spots. (J) Close-up of cephalic endopod claw. Arrowhead point at tooth on inner margin of main claw; arrow points at secondary claw behind main claw. All pictures taken in cross-polarized light, unless otherwise indicated. Additional abbreviations: ed., endite(s); edn, endite n; iex, exopod of intermediary appendage; texn, trunk exopod n. See Methods for remaining abbreviations. Scale bars: 10 mm (A, B); 5 mm (C, D); 1 mm (E-J). (JPEG 1526 kb)