Scabbardella altipes ( Henningsmoen, 1948 )

Zhen, Yong Yi, 2011, Middle to Late Ordovician (Darriwilian-Sandbian) Conodonts from the Dawangou Section, Kalpin Area of the Tarim Basin, Northwestern China, Records of the Australian Museum 63 (3), pp. 203-266 : 252

Scabbardella altipes ( Henningsmoen, 1948)

Fig. 9D–O

Drepanodus altipes Henningsmoen, 1948: 420 , pl. 25, fig. 14; Wang & Lou, 1984: 257, pl. 2, figs 3–4, 15, 17.

Scabbardella altipes (Henningsmoen) .– Orchard, 1980: 25–26, pl. 5, figs 2–5, 7–8, 12, 14, 18, 20, 23–24, 28, 30, 33, 35, text-fig. 4C (cum syn.); Nowlan, 1983: 668, pl. 1, figs 6–7, 11–14; Chen & Zhang, 1984b: 131, pl. 2, figs 29–30; Ni & Li, 1987: 437, pl. 55, figs 19–20, pl. 59, figs 21–22, 31–32; Chen & Zhang, 1989: pl. 5, figs 8–9; Gao, 1991: 137, pl. 12, fig. 18; Ding et al. in Wang, 1993:199, pl. 12, figs 26–27; Trotter & Webby, 1994: 487, pl. 3, figs 1–6, 8–11; Wang et al., 1996: pl. 1, fig. 18; Wang & Zhou, 1998: pl. 2, fig. 3; Ferretti & Serpagli, 1999: pl. 2, figs 17–23; Leslie, 2000: 1125, fig. 3.36–3.37; Sweet, 2000: fig. 9.14–9.15; Zhao et al., 2000: 221–222, pl. 23, figs 10–12; Rasmussen, 2001: 130, pl. 17, figs 4–5; Agematsu et al., 2007: 29–30, fig. 11.4, 11.8–11.10, 11.12–11.17 (cum syn.); Agematsu et al., 2008a: 969, fig. 10.25–10.34.

Dapsilodus similaris (Rhodes) .–An, 1981: pl. 3, figs 4–5; An & Ding, 1982: pl. 1, figs 17–18; An et al., 1983: 91, pl. 15, fig. 22; An & Xu, 1984: pl. 1, figs 8, 15; An et al., 1985: pl. 11, figs 9–10, 13–14; Ding, 1987: pl. 5, fig. 23; Duan, 1990: pl. 3, figs 13–15.

Scabbardella similaris (Rhodes) .– An, 1987: 179–180, pl. 5, figs 14–17, 19–24, 26–27; Ding et al. in Wang, 1993: 199, pl. 17, figs 22–28.

Material. 232 specimens from 17 samples (see Tables 1–2).

Remarks. The revised multielement concept given by Orchard (1980) is followed herein. Amongst the specimens of S. altipes illustrated by Orchard (1980) from the Upper Ordovician of England and Wales, seven morphotypes can be differentiated. They are short-based drepanodiform ( Orchard, 1980, pl. 5, figs 23, 33), long-based drepanodiform (pl. 5, fig. 24), acodiform with short base and erect or reclined cusp (pl. 5, figs 18, 20), acodiform with medium base ( Fig. 9F–G herein; Orchard, 1980, pl. 5, figs 14, 30), long-based acodiform ( Fig. 9D–E ; pl. 5, figs 3–4, 7–8, 12), long-based symmetrical distacodiform (pl. 5, figs 2, 35), and asymmetrical distacodiform ( Fig. 9H–O ; pl. 5, fig. 28).

Figures

Figure 9. A–C, Dapsilodus viruensis (Fåhraeus, 1966). A, Sc element, NIGP 152896, Nj375, outer lateral view (IY159-024). B–C, Sa element; B, NIGP 152897, Nj375, lateral view (IY159-025), tentatively assigned to this species; C, NIGP 152898, Nj375, lateral view (IY159-026). D–O, Scabbardella altipes (Henningsmoen, 1948). D–E, long-based acodiform element; D, NIGP 152899, Nj378, outer lateral view (IY153-016); E, NIGP 152900, Nj403, outer lateral view (IY161-021). F–G, medium-based acodiform element; F, NIGP 152901, Nj297, outer lateral view (IY159-012); G, NIGP 152902, AFT-X-K13/13, outer lateral view (IY167-002). H–O, asymmetrical distacodiform element; H, NIGP 152903, Nj376, outer lateral view (IY159-029); I–K, NIGP 152904, Nj378, I, outer lateral view (IY160- 017), J, inner lateral view (IY160-017), K, basal view (IY160-020); L–N, NIGP 152905, Nj379, L, upper view, close up of cross section of the cusp (IY160-035), M, inner lateral view (IY160-036), N, upper view (IY160-034); O, NIGP 152906, Nj379, outer lateral view (IY160-033). Scale bars 100 µm, unless otherwise indicated.