Scientific Classification
| Kingdom: Animalia |
| Phylum: Brachiopoda |
| Class: Rynchonellata |
| Order: Rynchonellida |
| Family: Leiorhynchidae |
| Genus: Eumetabolotoechia |
| Species: Eumetabolotoechia multicostatum (Hall, 1860) |
Information
Geological Range
Paleogeographic Distribution
Stratigraphic Occurrences
References
Hall, J., 1867 (as Leiorhynchus multicosta): p. 358, pl. 56.
Linsley, D., 1994: p. 189, figs. 1-19.
Wilson, K., 2014: pp. 106, 107.
Remarks
Originally described as Leiorhynchus multicosta by Hall in 1860. Recombined as Eumetabolotoechia multicosta by Sartenaer in 1975.
From Wilson (2014, p. 107): “Ovate shell, with length and width almost equal. Surface with 3-7 plications on the sinus and fold. Often found in a compressed condition. To 15-25 mm.”
From Carlton Brett and Gordon Baird: This globose, though usually highly flattened thin, silvery shelled rhynchonellid brachiopod is a mainstay of low diversity medium dark gray to black shale facies where it like Cherryvalleyrostrum commonly occurs as packed usually disarticulated valves on bedding plane assemblages in otherwise barren shales forming the “Leorhynchid Biofacies,” typical examples occur in the upper Skaneateles Fm. Butternut Member and the Ludlowvilee Ledyard Shale back facies. Associated fauna includes less common small chonetids small bivalves and flattened nautiloids; in the lower Ludlowville E. multicostum may occur in somewhat more diverse brachiopod Athyris biofacies, while in the upper Moscow E. multicostatum occurs with small Allanella and Emanuella praeumbona. Rare well preserved globose specimens are only present in concretions. This species is mainly found in deeper parts of the Appalachian Basin but closely related forms that may be simply ectomorphs, Eumetabolotoecha (formerly nudirostra) laura, and E. kellogi occur in the Skaneateles equivalent Arkona Shale (Ontario), Plum Creek Shale, and upper Silica Formation. Likewise, E. multicostata or closely related forms occur in the late Givetian Geneseo Shale. It is not clear where this lineage originated. Few if any leorhynchids are known from Eifelian or older deposits.
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