Figure 17. A–K in Middle to Late Ordovician (Darriwilian-Sandbian) Conodonts from the Dawangou Section, Kalpin Area of the Tarim Basin, Northwestern China

Figure 17. A–K, Polonodus newfoundlandensis Stouge, 1984. A–D, Pa (polyplacognathiform) element; A, NIGP 152992, AFT-X-K13/13, sinistral, upper view (IY165-026); B, NIGP 152993, AFT-X-K13/13, dextral, upper view (IY165-027); C, NIGP 152994, AFT-X-K13/13, sinistral, upper view (IY165-031); D, NIGP 152995, AFT-X-K13/13, dextral, upper view (IY165-025). E–K, dextral Pb (ambalodiform) element; E, NIGP 152996, AFT-X-K13/13, upper view (IY165-032); F–G, NIGP 152997, AFT-X-K13/13, F, upper view (IY165-029), G, upper view, close up showing reticulate surface structure (IY165-030); H–I, NIGP 152998, AFT-X-K13/13, H, upper view (IY165- 020), I, lateral view (IY165-022); J–K, NIGP 152999, AFT-X-K13/13, J, upper view (IY165-021), K, lateral view (IY165-023). L–M, Polonodus clivosus (Viira, 1974). Pa (polyplacognathiform) element, NIGP 153000, AFT-X-K13/13, L, upper view (IY163-018), M, outer lateral view (IY163-017). N–O, Gen. et sp. indet. Sd element, NIGP 153001, AFT-X-K13/13, N, basal view (IY163-014), O, inner lateral view (IY163-014). P–Q, Polonodus sp. A.?Pb element, NIGP 153002, AFT-X-K13/13, P, upper view (IY163-008), Q, inner lateral view (IY163-009). Scale bars 100 µm, unless otherwise indicated.