Ansella jemtlandica ( Löfgren, 1978 )

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 : 182

publication ID	https://doi.org/10.3853/j.0067-1975.55.2003.1383
persistent identifier	https://treatment.plazi.org/id/37439A20-CB26-FF30-FCBA-FF31FB76FC4D
treatment provided by	Felipe (2021-08-21 20:31:20, last updated 2023-11-09 19:44:58)
scientific name	Ansella jemtlandica ( Löfgren, 1978 )
status

Treatment

Ansella jemtlandica ( Löfgren, 1978)

Fig. 8K,L View Fig

Belodella sp. A Serpagli, 1974 : 38,39, pl. 8, fig. 7, pl. 20, fig. 10.

Belodella jemtlandica Löfgren, 1978: 46–49 , pl. 15, figs. 1–8, fig. 24A–D (cum syn.).

Belodella jemtlandica .– Cooper, 1981, pl. 26, fig. 14.

Ansella jemtlandica Fåhraeus & Hunter, 1985: 1173–1175 , pl. 1, figs. 1–5, 9, pl. 2, fig. 12a,b, text-fig. 1 (cum syn.).

Ansella jemtlandica .–Albanesi, in Albanesi et al., 1998: 160, pl. 1, figs. 18–23, text-fig. 27 (cum syn.).

Material. Four specimens ( Sa elements ) from the Tabita Formation at Mount Arrowsmith, and an additional specimen (Sa) from the unnamed dolomitic limestone unit at Koonenberry Gap.

Remarks. This species is rare in our collections, only the symmetrical Sa element being recovered. It has a proclined cusp, an anterolateral costa on each lateral side, and a thin posterior margin basally bearing a row of small, closely spaced denticles. The specimen illustrated from the Horn Valley Siltstone ( Cooper, 1981) is a weakly asymmetrical, acostate Sc element of the same species.

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.

Cooper, B. J., 1981. Early Ordovician conodonts from the Horn Valley Siltstone, central Australia. Palaeontology 24: 147 - 183.

Lofgren, A., 1978. Arenigian and Llanvirnian conodonts from Jamtland, northern Sweden. Fossils and Strata 13: 1 - 129.

Serpagli, E., 1974. Lower Ordovician conodonts from Precordilleran Argentina (Province of San Juan). Bollettino della Societa Paleontologica Italiana 13: 17 - 98.

Figures

Fig. 8. A–J, Bergstroemognathus kirki Stait & Druce, 1993: A, Pa element, AMF120307, M/A11-3, outer lateral view; B, Pb element, AMF120308, M/A11-3, outer lateral view; C, Pb element, AMF120309, M/A11-3, inner lateral view; D, M element, AMF120310, M/ A11-3, posterior view; E, Sa element, AMF120311, Y4–4, posterior view; F, Sa element, AMF120212, Y4–4, anterior view; G, Sb element, AMF120313, Y4–4, posterior view; H, Sc element, AMF120314, M/A11-3, posterior view; I, Sc element, AMF120315, M/ A11-3, anterior view; J, Sd element, AMF120316, M/A11-4, anterior view. K,L, Ansella jemtlandica (Löfgren, 1978): K, Sa element, AMF120317, M/A7, lateral view; L, Sa element, AMF120318, C1612, lateral view. M–Q, Acodus sp.: M–O, septicostae element, AMF120305, M/A11-3, lateral view; P, septicostae element,AMF120304, M/A11-3, lateral view; Q, quadricostae element,AMF120306, M/A11-3, lateral view. Scale bars 100 µm.