Scolopodus quadratus Pander, 1856

Zhen, Yong Yi, Percival, Ian G. & Webby, Barry D., 2003, Early Ordovician Conodonts from Far Western New South Wales, Australia, Records of the Australian Museum 55 (2), pp. 169-220 : 212

publication ID	https://doi.org/10.3853/j.0067-1975.55.2003.1383
persistent identifier	https://treatment.plazi.org/id/37439A20-CB00-FF16-FC47-FE35FAE3F9AC
treatment provided by	Felipe (2021-08-21 20:31:20, last updated 2023-11-09 19:44:58)
scientific name	Scolopodus quadratus Pander, 1856
status

Treatment

Fig. 27A–O View Fig

Scolopodus quadratus Pander, 1856: 26 , pl. 2, fig. 6a–d, pl.A, fig. 5d.

Scolopodus costatus Pander, 1856: 26 , pl. 2, fig. 7a–d, pl.A, fig. 5e.

Scolopodus striatus Pander, 1856: 26 , pl. 2, fig. 8a–d, pl. A, fig. 5f.

Scolopodus rex Lindström, 1955: 595 , 596, pl. 3, fig. 32.

Scolopodus rex var. paltodiformis Lindström, 1955: 596 , pl. 3, figs. 33, 34.

Scolopodus quadratus .– Fåhraeus, 1982: 21, pl. 2, figs. 1–14, pl. 3, figs. 1–8, 15.

Scolopodus rex .– Seo et al., 1994, fig. 10.10–10.12.

Scolopodus rex .–Albanesi, in Albanesi et al., 1998: 133, pl. 12, figs. 14–17 (cum syn.).

Scolopodus quadratus .–Zhen et al., in press: pl. 5, figs. 15–21 (cum syn.).

Material. One specimen (Sd) from limestone nodules within shales of the upper Yandaminta Quartzite and 37 specimens (4 Pb, 12 Sa, 12 Sb, 1 Sc, 8 Sd) from the overlying Tabita Formation at Mount Arrowsmith ; two specimens (1 Sa, 1 Sd) from the unnamed dolomitic limestone unit at Koonenberry Gap .

Remarks. Five element types have been recovered from the Tabita Formation, including a scandodiform Pb element with a proclined cusp, four costae on the inner lateral face and a smooth outer lateral face ( Fig. 27A–C View Fig ), and four scolopodiform elements: the symmetrical Sa ( Fig. 27D–F View Fig ), nearly symmetrical Sb ( Fig. 27G–I View Fig ), laterally compressed nearly symmetrical Sc element ( Fig. 27M–O View Fig ), and asymmetrical Sd element with slightly twisted cusp ( Fig. 27J–L View Fig ). However, the species is highly variable, and there are intermediate morphotypes varying in the number of costae, symmetry, curvature of the cusp, and degree of lateral compression. Scolopodus quadratus also occurs in the slightly older Hensleigh Siltstone of the Lachlan Fold Belt (Zhen et al., in press).

Triangulodus van Wamel, 1974

Type species. Paltodus volchovensis Sergeeva, 1963 .

References

Albanesi, G. L., M. A. Hunicken & C. R. Barnes, 1998. Bioestratigrafia, biofacies y taxonomia de conodontes de las secuencias ordovicicas del Cerro Porterillo, Precordillera central de San Juan, R. Argentina. Actas de la Academia Nacional de Ciencias 12: 1 - 249.

Fahraeus, L. E., 1982. Recognition and redescription of Pander's (1856) Scolopodus (form) species - constituents of multielement taxa (Conodontophorida, Ordovician). Geologica et Palaeontologica 16: 19 - 28.

Lindstrom, M., 1955. Conodonts from the lowermost Ordovician strata of south-central Sweden. Geologiska Foreningens i Stockholm Forhandlingar 76: 517 - 604.

Pander, C. H., 1856. Monographie der fossilen Fische des Silurischen Systems der Russisch-Baltischen Gouvernements. St. Petersburg: Akademie der Wissenschaften.

Seo, K. S., H. Y. Lee & R. L. Ethington, 1994. Early Ordovician conodonts from the Dumugol Formation in the Baegunsan Syncline, eastern Yeongweol and Samcheog areas, Kangweon- Do, Korea. Journal of Paleontology 68 (3): 599 - 616.

Sergeeva, S. P., 1963. Conodonts from the Lower Ordovician of the Leningrad region. Akademia Nauk SSSR Paleontologicheskiy Zhurnal 1963 (2): 93 - 108.

van Wamel, W. A., 1974. Conodont biostratigraphy of the Upper Cambrian and Lower Ordovician of north-western Oland, south-eastern Sweden. Utrecht Micropalaeontological Bulletins 10: 1 - 125.

Figures

Fig. 27. Scolopodus quadratus Pander, 1856: A–C, Pb element, AMF120472, Y4–2, A, outer lateral view, B, outer lateral view of the basal part, showing fine striae, C, inner lateral view; D–F, Sa element, AMF120475, Y4–2, D,F, lateral views, E, close up showing sharp costae and fine striae; G,H, Sb element,AMF120473,Y4–2, G, outer lateral view, H, inner lateral view; I, Sb element,AMF120471, Y4–2, inner lateral view; J–L, Sd element, AMF120474, W5, J, posterior view, K, inner lateral view, L, outer lateral view; M–O, Sc element, AMF120470, TAB1/8.1, M, outer lateral view, N, inner lateral view, O, basal view. Scale bars 100 µm.