Scientific Classification
| Kingdom: Animalia |
| Phylum: Brachiopoda |
| Class: Rynchonellata |
| Order: Spiriferida |
| Family: Cyrtinidae |
| Genus: Cyrtina |
| Species: Cyrtina hamiltonensis Hall, 1857 |
Information
Geological Range
Paleogeographic Distribution
Stratigraphic Occurrences
References
Hall, J., 1867: p. 268m pl. 44.
Wilson, K., 2014: pp. 112, 113].
Linsley, D., 1994: p. 201, figs. 1-21.
Remarks
Originally described as Cyrtina hamiltonensis by Hall in 1857.
From Wilson (2014, p. 112): “Small shell. Pedicle valve pyramidal, with beak strongly incurved, and strong sinus. Brachial valve slightly convex, with broad fold. To 10-15 mm.”
From Carl Brett: Cyrtina is a very widespread and long-ranging EAR genus and C. hamiltonensis is found in many facies of the Onondaga and Hamilton Group; it is reported to range from the upper Emsian Schoharie Formation into the Frasnian “Chemung facies”. A complex of related species, most notably “C. alpenensis” is reported from the Michigan Basin. This small, sub-triangular brachiopod with a very large triangular interarea was likely adapted to soft mud substrates and appear to range from offshore mildly dysoxic facies to shallow water carbonates. It occurs in moderate diversity offshore mudstone-siltstone assemblages to high diversity shallow water assemblages but is not particularly common in eastern siltstone facies. Its most common position in faunal gradients is in the western athyris-Mediospirifer to diverse brachiopod assemblages.
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