Costiconus ethingtoni ( Fåhraeus, 1966 )

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 : 221

publication ID	https://doi.org/ 10.3853/j.0067-1975.63.2011.1586
persistent identifier	https://treatment.plazi.org/id/03CCEB77-FFC2-6360-FFA4-F89A97A7FB2E
treatment provided by	Felipe
scientific name	Costiconus ethingtoni ( Fåhraeus, 1966 )
status

Treatment

Costiconus ethingtoni ( Fåhraeus, 1966)

Figs 6–7 View Figure 6 View Figure 7

Panderodus ethingtoni Fåhraeus, 1966: 26 , pl. 3, fig. 5a–b.

Walliserodus ethingtoni (Fåhraeus) .– Bergström et al., 1974: pl. 1, fig. 12; An & Ding, 1982: pl. 2, figs 7–8; An et al., 1983: 162, pl. 26, figs 16–18; An & Xu, 1984: pl. 2, fig. 6; Wang & Lou, 1984: 288, pl. 3, figs 1–5; An et al., 1985: pl. 10, figs 19–22; Ding, 1987: pl. 5, fig. 24; Chen & Zhang, 1989: pl. 5, fig. 24; Pohler & Orchard, 1990: pl. 2, fig. 19; Ding et al. in Wang, 1993: 213, partim only pl. 18, figs 4–6, 9, 11; Chen & Bergström, 1995: pl. 8, figs 13–14; Wang et al., 1996: pl. 1, fig. 15; Albanesi in Albanesi et al., 1998: 114, pl. 14, figs 20–25, text-fig. 8; Zhang, 1998c: 95–96, pl. 18, figs 10–15; Wang & Bergström, 1999 a: 344, pl. 3, figs 6–7; Lehnert et al., 1999: pl. 2, fig. 6; Wang & Qi, 2001: pl. 2, fig. 27; Wang, 2001: pl. 1, figs 25–26; Pyle & Barnes, 2002: pl. 22, figs 19–22.

Costiconus ethingtoni (Fåhraeus) .– Rasmussen, 2001, 62–64, pl. 3, figs 16–18 (cum syn.); Zhen et al., 2009a: 139–140, fig. 3A–W; Zhen et al., 2009b: 31–33, fig. 4H–W (cum syn.); Viira, 2011: fig. 7O, Q.

Material. 443 specimens from 27 samples (see Tables 1–2).

Remarks. Specimens of this species recovered from the Dawangou section are identical with those recently described from the Yenwashan Formation of the JCY area of South China (Zhen et al., 2009a) and from the Thompson Creek area in New Zealand (Zhen et al. 2009b). Based on a large collection from Dawangou, C. ethingtoni is interpreted as a septimembrate apparatus including a non-geniculate shortbased M element ( Fig. 6A–D View Figure 6 ), multicostate long-based S (Sa, Sb, Sc and Sd) elements ( Fig. 7A–T View Figure 7 ) that show a wide variation in respect to the number of costae, and non-costate Pa ( Figs 6J–L View Figure 6 , 7U View Figure 7 ) and Pb ( Fig. 6E–I View Figure 6 ) elements. The four types of the S elements were described in detail by Zhen et al. (2009a). The M element defined herein was previously referred to as a P element (see Zhang, 1998c, pl. 18, fig. 10; Zhen et al., 2009a, fig. 3R–W; Zhen et al., 2009b, fig. 4T-W) from which it can be distinguished by having a shorter and more posteriorly flared base. The P elements defined herein were previously referred to as representing the M element (e.g., Zhang, 1998c, pl. 18, fig. 11), and show a rather wide variation from long-based ( Fig. 7U View Figure 7 ) to relatively short-based ( Fig. 6G View Figure 6 ).

Kingdom	Animalia
Phylum	Chordata
Class	Conodonta
Order	Conodontophorida
Genus	Costiconus