Figure 16. Periodon aculeatus Hadding 1913. A–B, M in Middle to Late Ordovician (Darriwilian-Sandbian) Conodonts from the Dawangou Section, Kalpin Area of the Tarim Basin, Northwestern China

Figure 16. Periodon aculeatus Hadding 1913. A–B, M element; A, NIGP 152979, posterior view (IY145-001); B, NIGP 152980, anterior view (IY145-002). C–E, Sa element; C–D, NIGP 152981, C, anterior view (IY145-003), D, lateral view (IY145-004); E, NIGP 152982, lateral view (IY145-006). F–I, Sb element; F–G, NIGP 152983, F, inner lateral view (IY145-010), G, outer lateral view (IY145-013); H–I, NIGP 152984, H, upper view (IY145-018), I, inner lateral view (IY145-020). J–K, Sc element; J, NIGP 152985, outer lateral view (IY145-016); K, NIGP 152986, inner lateral view (IY145-017). L–N, Pa element; L, NIGP 152987, inner lateral view (IY145-023); M, NIGP 152988, outer lateral view (IY145-024); N, NIGP 152989, basal view (IY145-025N). O–P, Pb element; O, NIGP 152990, outer lateral view (IY145-027); P, NIGP 152991, inner lateral view (IY145-026). All from sample Nj294; scale bars 100 µm.