Figure 2
Cephalon (or cranidia), librigenae and thoracic segments of Gunnia sp. from Cambrian Stage 5 Duyun fauna.
(a–c) YKLP 12034, degree 0 meraspis (M0), cephalon with a pair of broad genal spines, articulated with its transitory pygidium, which displays three axial rings: (a) oblique latero-dorsal view; (b) oblique postero-dorsal view, showing the secondary coating (white arrowed) and the first transverse joint (black arrowed); (c) dorsal view. (d) YKLP 12035, cephalon of meraspid degree 0 (M0), ventral view; (e) YKLP 12036, cephalon of meraspid degree 1 (M1), dorsal view; (f) YKLP 12037, cranidium of meraspid degree 3 (M3) with fine granules on the outer surface, dorsal views. (g) YKLP 12038, fragmentary cranidium of meraspid degree 4 (M4), ventral view, showing the broad right genal spine with partially survived doublure along the posterior margin. (h) YKLP 12039, cranidium of meraspis, clearly showing deep occipital furrow and three glabellar furrows (arrowed). (i), (j) crack-out cranidia, dorsal views: (i) YKLP 12040, late maraspis showing partially preserved palpebral lobe; (j) YKLP 12041, early holaspis showing well-preserved impressions of three paired glabellar furrows. (k), (l) Librigena of Gunnia sp.: (k) YKLP 12042, ventral view; (l) YKLP 12043, dorsal view, showing fine granules on the surface. (m) YKLP 12044, dorsal view, right half of a meraspid thoracic segment; (n) YKLP 12045, ventral view, right half of a holaspid thoracic segment. S0 = occipital furrow; S1–S3 = glabellar furrows. Scale bars for (a–h) 300 µm; for (i), (j) 1 mm; for (k–n) 200 µm.
