Scientific Classification
| Kingdom: Animalia |
| Phylum: Brachiopoda |
| Class: Strophomenata |
| Order: Strophomenida |
| Family: Strophodontidae |
| Genus: Strophodonta |
| Species: Strophodonta demissa (Conrad, 1842) |
Information
Geological Range
Paleogeographic Distribution
Stratigraphic Occurrences
References
Hall (1867): p. 81 p. 101, pl. 10 and 11 pl. 17.
Linsley (1994): p. 172.
Wilson (2014): pp. 98, 99.
Remarks
Originally described as Strophomena demissa by Conrad in 1842. Recombined as Strophodonta demissa by Hall in 1847. Sometimes spelled as Stropheodonta demissa, but this is not original to Hall’s description and seems to have mostly fallen out of favor in modern publications.
From Wilson (2014, p. 99): “Medium-sized shell with coarse, sharp striae and concentric growth lines. Pedicle valve convex, brachial valve concave. To 30mm.”
From Carlton Brett and Gordon Baird: “An Eastern Americas Realm taxon it is typical of high diversity calcareous facies from the Eifelian Onondaga-Columbus formations to the Hamilton Group. It is common in the shallow water limestones and marls of the Givetian Skaneateles and Ludlowville formations where it is part of the Pseudoatrypa-Megastrophia biofacies. However, it is vanishingly rare in the Moscow Formation; only a few specimens were observed by Brett and Baird in examination of nearly all outcrops in western and central New York. Oddly this species or a closely related form has been reported from siltstone the Ithaca Formation a very uncharacteristic occurrence of some of the latest forms.; S. demissa is often associated with small rugose corals, bryozoans and diverse brachiopods particularly other strophomenids. It is commonly encrusted by auloporid corals.”
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