Scientific Classification
| Kingdom: Animalia |
| Phylum: Brachiopoda |
| Class: Rynchonellata |
| Order: Spiriferida |
| Family: Ambocoeliidae |
| Genus: Emanuella |
| Species: Emanuella praeumbona (Hall, 1857) |
Information
Geological Range
Paleogeographic Distribution
Stratigraphic Occurrences
| Tully Formation |
| Moscow Formation |
| Garrettsville Member |
| Windom Member |
References
Hall, J., 1867 (as Ambocoelia praeumbona): p. 252[pl. 44], (https://www.biodiversitylibrary.org/page/55019058#page/633/mode/1up).
Wilson, K., 2014: pp. 112, 113.
Linsley, D., 1994: p. 200, figs. 16-21.
Remarks
Originally described as Orthis praeumbona by Hall in 1857. Recombined as Ambocoelia praeumbona by Hall in 1860. Recombined as Emanuella praeumbona by Goldman and Mitchell in 1990.
From Wilson (2014, p. 112): “Shell with length greater than width. Pedicle valve strongly convex; brachial valve flat. Larger than A. umbonata. To 15 mm.
From Carlton Brett and Gordon Baird: A distinctive globose brachiopod usually with a pale bluish white color. This form is of uncertain origin and of highly restricted occurrence being confined to two thin dark shale intervals (epibole) in the upper Moscow Formation, upper Windom Fisher Gully Beds and Garrattsville (Simpson Creek Bed). However, at these levels it may be super abundant forming shell pavements. One such interval, the Amsdell Bed, has been traced across much of New York State from Erie County to North Blenheim in Schoharie County. It has been reported as rare specimens in the Mahantango Formation (Willard, 1932; Penn. Geol. Surv. Bull.); however, we suggest that it may have been confused with Emmanella subumbona. This brachiopod is associated with a low diversity assemblage that includes Eumetabolotoechia multicosta, chonetids and small Athyris cf. cora as well as nautiloids and Elderedgeops trilobites. It rarely occurs with Ambocoelia umbonata, perhaps because E. praeumbona represents a slightly more dysoxic adapted taxon or perhaps owing to intraspecific competition. These commonly occur in dark calcareous shale but also in concretionary limestones in Erie County.
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