Scolopodus houlianzhaiensis An & Xu
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publication ID |
https://doi.org/ 10.3853/j.0067-1975.61.2009.1520 |
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persistent identifier |
https://treatment.plazi.org/id/03EFCB66-6E5C-5525-FE81-F9DDFDF0FDDA |
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treatment provided by |
Felipe |
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scientific name |
Scolopodus houlianzhaiensis An & Xu |
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Scolopodus houlianzhaiensis An & Xu in An et al., 1983
Fig. 10A–K View Fig
Scolopodus rex houlianzhaiensis An & Xu in An et al., 1983: 148, pl. 12, figs 23–27, text-fig. 11.7, 11.8;? Ding, 1987: pl. 6, fig. 23; non Ding et al. in Wang, 1993: 205, pl. 14, figs 13–15.
Scolopodus houlianzhaiensis An & Xu. —Zhen et al., in press a: fig. 9G–L.
Material. 19 specimens from three samples ( Table 1).
Remarks. The multicostate Sa (symmetrical) and Sb (asymmetrical) elements of Scolopodus houlianzhaiensis show some resemblance to S. quadratus , but the distinctive Sc element has a strongly compressed cusp and lateral costae restricted to near the anterior margin ( Fig. 10J, K View Fig ). An & Xu (in An et al., 1983) considered this species as a subspecies of Scolopodus rex Lindström, 1955 , which is now regarded as a junior synonym of Scolopodus striatus Pander, 1856 (see Fåhraeus, 1982, Zhen et al., 2004; Tolmacheva, 2006).
An & Xu (in An et al., 1983) suggested a bimembrate apparatus including symmetrical and asymmetrical elements. Three morphotypes, representing symmetrical multicostate Sa, asymmetrical multicostate Sb, and strongly asymmetrical Sc elements, can be recognized among our Emanuel material. The Sa element ( Fig. 10A–D View Fig ) has a broad anterior face, five or six sharp costae on each side and a costa along the posterior margin, and is identical with the symmetrical element defined by An et al. (1983, pl. 12, figs 23–25) from the Liangjiashan Formation of North China. The Sb element [ Fig. 13 View Fig caption continued]… G,H, Sb element, AM F.135823, WHC36, (G), antero-outer lateral view, bearing 10 laminar layers (IY133-013), (H), close up showing denticles along anterior margin of each laminar layer (IY133-014). I,J, Sc element, AM F.135824, WHC36, (I), antero-outer lateral view, bearing 17 laminar layers (IY133-006), (J), posterior view (IY134-001). K, L, Sc element, AM F.135825, THH12, (K), anterior view, bearing 20 laminar layers (IY133-044), (L), posterior view (IY134-029). (N), Sc element, AM F.135826, WHC35, close up showing the small ring-like node representing the initial stage of the element (IY134-014). (O), Sc element, AM F.135817 (same specimen as Fig. 12I View Fig ), YTH10, close up showing the rounded pit-like initial stage of the element (IY133-028). Scale bars 100 µm, unless indicated otherwise.
resembles the Sa, but is asymmetrical with a more convex outer lateral face ( Fig. 10E–G View Fig ). The Sc element is identical with the asymmetrical element represented by the holotype of the species from the Liangjiashan Formation of North China ( An et al., 1983, pl. 12, fig. 26) with a convex outer lateral face and concave inner lateral face and with several costae (2 to 4) near the anterior margin ( Fig. 10H–K View Fig ). Zhen et al. (in press a, fig. 9G–L) reported the occurrence of this species in the Honghuayuan Formation in Guizhou. The Sc element recently illustrated from the Honghuayuan Formation in Guizhou (Zhen et al., in press a, fig. 9G–I) shows a more compressed base, and the Sa element (Zhen et al., in press a, fig. 9J–L) has the base less extended posteriorly, with costae on the lateral face more towards anterior .
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