File:Figure 1. Trunk and appendage morphology of Isoxys curvirostratus from the early Cambrian (Stage 3) Chengjiang in South China.jpg

English: Figure 1. Trunk and appendage morphology of Isoxys curvirostratus from the early Cambrian (Stage 3) Chengjiang in South China. a–j, YKLP 16260. a, Complete specimen of Isoxys curvirostratus photographed under reflected light. b, Tomographic model of complete specimen in lateral view. c, Detail of tomographic model showing anterior trunk region in lateral view. d, Anterior trunk region with carapace digitally removed. e, Tomographic model of isolated first trunk appendage pair in lateral view showing morphology of endopod (purple) and exopod (blue). f, Tomographic model of second appendage pair in ventral view. g, Tomographic model of isolated third appendage pair in ventral view. h, Tomographic model of fourth appendage pair in ventral view. i, Tomographic model of seventh appendage pair in lateral view. j, Tomographic model of eighth appendage pair in lateral view, showing presence of elongate multi-articulated spines. k, l, YKLP 16261a. k, complete specimen of Isoxys curvirostratus photographed under reflected light, showing partially disarticulated carapace and unarthrodized trunk. l, magnification of unarthrodized trunk and paddle-shaped lamellae in exopod. m–o, YKLP 16266. m, Complete specimen of Isoxys cf. curvirostratus with well-preserved frontal appendages photographed under reflected light. n, Detail of raptorial frontal appendages. o, Detail of elongate terminal claw showing short endites. Abbreviations: an, the nth ventral appendage; as, anterior spine; en, endopod; es, eye stalk; ex, exopod; ey, eye; fa, frontal appendage; fn, podomeres of the frontal appendage from the distal to proximal; la, lamellae of exopod; ltp, lateral processes of telson; pes, the paired spines on each endite; pf, proximal part of the frontal appendage; pps, paired posterior spines on endopod; ps, posterior cardinal spine of carapace; sp, spines; st, striated ornament; te, telson; tr, trunk. Numbers indicate endopod podomeres. Scale bars: a, b, k, m, 5 mm; c, d, 2.5 mm; e, 1 mm; f–h, 0.5 mm; i, j, o, 1 mm.