Ambocoelia umbonata (Conrad 1842)

Taxonomy

Lamp shell

Kingdom: Animalia
Phylum: Brachiopoda
Class: Rhynchonellata
Order: Spiriferida
Family: Ambocoeliidae
Genus: Ambocoelia
Species: Ambocoelia umbonata
Author Citation Conrad 1842

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: 6 mm
Width: 7 mm
Height: 3 mm

Location

Penn-Dixie Quarry
Erie County
New York
United States

• a. umbonata
• ambocoelia
• ambocoeliidae
• brachiopod
• devonian
• erie county
• hamilton group
• lamp shell
• moscow formation
• new york
• pdq 06132014 002b
• penn-dixie
• rhynchonellata
• spiriferida
• 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.

 

A very common fossil in Hamilton Group sediments. Similar to Emanuella praeumbona, distinguished from E. praeumbona by the hinge width; the hinge of A. umbonata spans the width of the valve, while that of E. praeumbona is narrower. A. umbonata has a nearly flat brachial valve, while that of E. praeumbona shows a convex profile. Full-sized specimens of A. umbonata are also not as large as E. praeumbona.

 

Originally designated Orthis umbonata. A. umbonata has been defined as the type species of Ambocoelia by Hall.

 

References:

 

Wilson, K. A. “Field Guide to the Devonian Fossils of New York” (2014). Paleontological Research Institution Special Publication No. 44.

 

Linsley, D. M. “Devonian Paleontology of New York” (1994). Paleontological Research Institution Special Publication No. 21.

 

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

 

Fossilworks. http://fossilworks.org