Fig. 2
From: First report of paired ventral endites in a hurdiid radiodont
Hurdiid frontal appendages bearing auxiliary spines. a and d Peytoia nathorsti from the Burgess Shale, British Columbia, Canada, USNM 240984. b and e ?Peytoia from the Burgess Shale, British Columbia, Canada, ROM 59508 (?Laggania of [22]). c and f. Hurdia from the Burgess Shale, British Columbia, Canada, ROM 60048. g and h Stanleycaris hirpex from Stephen Formation, British Columbia, Canada, ROM 59975. Abbreviations: den, distal endites; ds, dorsal spines; five en, five subequal endites on first five podomeres of distal articulated region; pdb, podomere boundary; s, shaft; sen, shaft endite. Scale bars = 10 mm