Hadromeros submitis Lane 1971
| Autor: | Fortey, Richard A., Wernette, Shelly J., Hughes, Nigel C. |
|---|---|
| Rok vydání: | 2022 |
| Předmět: | |
| DOI: | 10.5281/zenodo.6816311 |
| Popis: | Hadromeros ? submitis (Reed, 1915) Fig. 13.1 1915 Cheirurus submitis Reed, p. 49, pl. 8, figs 13,14. Material. Lectotype (selected herein): cranidium from Upper Naungkangyi Beds (Katian), Lilu, northern Shan State, Myanmar, Fig. 13.1 (Reed, 1915, pl. 8, figs 13,14), GSI 11560. Discussion. We illustrate here a cast taken from the lectotype, original of Reed (1915, pl 8. fig. 14). Only the cephalon is known of this species, which is only generally cheirurine, and invites comparison with those of many other species of similar age. It does, however, have very large, prominent but scattered tubercles on the cheeks and frontal lobe of the glabella. Many somewhat similar later Ordovician Chinese cheirurines have been assigned to the genus Parisoceraurus by Zhou & Zhen (2008) but these do not have such prominent tubercles. One species from the Pagoda Formation of Sichuan attributed (under open nomenclature) to Hadromeros by Zhou et al. (2016, pl. 14, fig. 14) does invite comparison with H.? submitis in showing very coarse, scattered tubercles over the fixed cheeks and forward part of the glabella, and may support a tentative assignment to Hadromeros. However, the Sichuan specimen and the type species of Hadromeros both show relatively long (tr.) glabellar furrows compared with H.? submitis, while the frontal glabellar lobe of the latter is relatively short (sag.) and wide. This structure seems to be unusual in cheirurids, and the distinctive glabellar lobation of the Myanmar species may indicate that it could belong to an undescribed genus, but without a pygidium this cannot be verified. Published as part of Fortey, Richard A., Wernette, Shelly J. & Hughes, Nigel C., 2022, Revision of F. R. C. Reed's Ordovician trilobite types from Myanmar (Burma) and western Yunnan Province, China, pp. 301-356 in Zootaxa 5162 (4) on pages 340-341, DOI: 10.11646/zootaxa.5162.4.1, http://zenodo.org/record/6810290 {"references":["Reed, F. R. C. (1915) Supplementary Memoir on new Ordovician and Silurian fossils from the Northern Shan States. Palaeontologia Indica, New Series 6, 1 - 98.","Zhou, Z. - Y. & Zhen, Y. - Y. (Eds.) (2008) Trilobite Record of China. Science Press, Beijing, 20 pp.","Zhou, Z. - G., Zhou, Z. - Y. & Xiang, L. - W. (2016) Trilobite fauna from the Ordovician Pagoda Limestone Formation of Central and Western Yangtze block, China. Geological Publishing House, Beijing, 422 pp. [in Chinese]"]} |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|