Emanuella praeumbona (Hall 1857)

Taxonomy

Lamp shell

Kingdom: Animalia
Phylum: Brachiopoda
Class: Rhynchonellata
Order: Orthida
Family: Orthidae
Genus: Emanuella
Species: Emanuella praeumbona
Author Citation Hall 1857

Geological Time Scale

Eon: Phanerozoic
Era: Paleozoic
Period: Devonian
Sub Period: None
Epoch: Middle
International Age: Givetian

Stratigraphy

Hamilton Group
Moscow Formation
Windom Member

Provenance

Collector: Mediospirifer
Date Collected: 06/13/2014
Acquired by: Field Collection

Dimensions

Length: 9 mm
Width: 9 mm
Height: 7 mm

Location

Penn-Dixie Quarry
Erie County
New York
United States

• brachiopod
• devonian
• e. praeumbona
• emanuella
• erie county
• hamilton group
• lamp shell
• moscow formation
• new york
• orthida
• orthidae
• pdq 06132014 001
• penn-dixie
• rhynchonellata
• windom member

Comments

Found as surface float near the top of the Windom exposure, a few feet below the Genundewa Limestone at Penn-Dixie Quarry in Hamburg, NY.

 

Distinguished from Ambocoelia umbonata by the hinge width; the hinge of A. umbonata spans the width of the valve, while that of E. praeumbona is narrower. E. praeumbona also shows a convex profile to the brachial valve, and grew to a larger size. E. praeumbona is common in the Hamilton Group only within the upper layers of the Windom Member.

 

Originally designated Orthis praeumbona, later assigned to Ambocoelia, then reassigned to Emanuella in 1990.

 

References:

 

Hall, J. Palaeontology of New York v.  4. (1867)

Fossilworks. http://fossilworks.org

 

Yale Peabody Museum Collections website (http://peabody.yale.edu/collections/invertebrate-paleontology)

 

Brett, C. E. Biostratigraphy and Paleoecology of the Windom Shale Member (Moscow Formation) in Erie County, NY.  1974. State University of New York at Buffalo.