Nevadia ovalis McMenamin 1987 ...
? Nevadia ovalis McMenamin, 1987 (Fig. 6.3, 6.5, 6.6) ? Nevadia ovalis MCMENAMIN, 1987, p. 744, figs. 5.2, 5.5, 5.6, 6.1, 6.3, 6.4, 6.6. Material examined. PWNHC-2009.20.22 and KUMIP-320712-320713 from Nevadella zone, Early Cambrian, Sekwi Formation, Mackenzie Mountains, Northwest Territories, Canad...
| Main Authors: | , , , |
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| Format: | Text |
| Language: | unknown |
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Zenodo
2011
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.5281/zenodo.6189866 https://zenodo.org/doi/10.5281/zenodo.6189866 |
| Summary: | ? Nevadia ovalis McMenamin, 1987 (Fig. 6.3, 6.5, 6.6) ? Nevadia ovalis MCMENAMIN, 1987, p. 744, figs. 5.2, 5.5, 5.6, 6.1, 6.3, 6.4, 6.6. Material examined. PWNHC-2009.20.22 and KUMIP-320712-320713 from Nevadella zone, Early Cambrian, Sekwi Formation, Mackenzie Mountains, Northwest Territories, Canada (Section 1, 199.5– 300 m above base of formation and in float). Discussion. These specimens may be referable to Nevadia ovalis McMenamin 1987 originally described from the middle shaley interval of unit 3 of the Puerto Blanco Formation of Sonora, Mexico. For instance, the material from the Sekwi Formation appears to match that species in possessing the anterior and posterior cephalic borders much wider than in other species of Nevadia, and the extraocular area much narrower, as well as a cephalon that has an ovate shape along its anterolateral margins. However, because neither McMenamin’s (1987) original material nor the new material from the Sekwi Formation is particularly well preserved, our assignment is ... : Published as part of Gapp, Wesley, Lieberman, Bruce S., Pope, Michael C. & Dilliard, Kelly A., 2011, New olenelline trilobites from the Northwest Territories, Canada, and the phylogenetic placement of Judomia absita Fritz, 1973, pp. 15-28 in Zootaxa 2918 on page 23, DOI: 10.5281/zenodo.202343 ... |
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