Brachidontes euglyphus (Woods, 1922)
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publication ID |
https://doi.org/ 10.1080/00222933.2018.1524032 |
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DOI |
https://doi.org/10.5281/zenodo.3671180 |
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persistent identifier |
https://treatment.plazi.org/id/03BB2338-E340-E232-FE04-A5545E88FDC3 |
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treatment provided by |
Valdenar |
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scientific name |
Brachidontes euglyphus (Woods, 1922) |
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Brachidontes euglyphus (Woods, 1922)
( Figure 2 View Figure 2 (d), 2(e))
Mytilus euglyphus Woods 1922 , 63, pl. 1, figs. 6, 7.
Mytilus euglyphus ? [sic] Woods 1922, 63, pl. 1, fig. 8.
Mytilus euglyphus var. negritensis Olsson 1928 , 21, pl. 4, fig. 4.
Remarks
Woods (1922) and Olsson (1928) concurred that small ribbed mytilids from the Eocene Turritella Series of Woods (1922) (=lower lower Eocene Negritos Member of the San Cristobal Formation of Martinez et al. (2005)) have coarser sculpture than those specimens described by Woods (1922) from his Clavilithes Series (Chacra Formation of Martinez et al. (2005)). Ribbed mytilids range through the Salina Member of the San Cristobal Formation and the Pariñas and Chacra formations (Olsson 1928), i.e. the entire lower Eocene. Contrary to Olsson (1928), the Negritos Member ribbed mytilids are not always more strongly angled from the dorsal to ventral margin, as evidenced by Woods ’ s (1922) fig. 8. The Negritos Member specimens are likely ecological variants of the temporally wide-ranging B. euglyphus , which was also much larger in size than previously recognised, judging from a northern Peruvian specimen, nine cm long, in Olsson ’ s undescribed material in the Smithsonian National Museum of Natural History. Volsella cerva (Olsson, 1944) is a radially sculpted late Campanian mytilid from the Tortuga and La Mesa formations in the Sechura Basin of northern Peru ( Olsson 1944; Dhondt and Jaillard 2005) that should be transferred to Brachidontes . The Tortuga Formation species has a broadly rounded posterior umbonal ridge.
Material
UWBM 107551, right valve, mould, B8772, L (11.6), H (30.0), W (7.8).
Occurrence
Lower Eocene, San Cristobal, Pariñas, and Chacra formations, Talara Basin, northern Peru; Lower Paleogene, Cuenca Member, Caballas Formation, East Pisco Basin, southern Peru.
| UWBM |
University of Washington, Burke Museum |
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