Rhamphoverritor reduncus. (a–d,h,k) Free swimming stage, holotype (OUM C.29587); (e–g,i,j,l) juvenile (OUM C.29588); Wenlock Series, Herefordshire, England. (a–j) ‘Virtual’ reconstructions; (k,l) specimens in rock. (a) Posterior stereo-pair, magnification×19. (b) Dorsal stereo-pair, magnification×19. (c) Ventral stereo-pair, head shield removed, arrow indicates possible appendage posterior to mouth, magnification×19. (d) Lateral view, magnification×19. (e) Lateral view, magnification×18. (f) Dorsal stereo-pair, magnification×18. (g) Ventral stereo-pair, head shield removed, magnification ×18. (h) Lateral view, head shield removed, magnification×19. (i) Lateral view, head shield removed, arrow indicates constriction between peduncle and inner plates, magnification×18. (j) Posterior stereo-pair, magnification×18. (k,l) Transverse sections prior to serial-grinding, magnification×20. Abbreviations are as follows: a, antennules; ab, abdomen; ag, anterior groove in head; sp, spines; ca, cavity; cf, caudal furca; df, dorsal furrow; h, head; hs, head shield; i, indentation in valves; ip, internal plates; m, mouth; mc, mouth cone; p, peduncle; pa, posterior appendages; pb, predatory boring; pg, (inner) plate groove; r, ridge; s1–4, segments in antennules; t, thorax; te, telson; tl, thoracic limbs.