Chonetes bastini

By Mainefossils

• March 18, 2021

Taxonomy

Kingdom: Animalia
Phylum: Brachiopoda
Class: Strophomenata
Order: Productida
Family: Chonetidae
Genus: Chonetes
Species: Chonetes bastini
Author Citation Williams, 1913

Geological Time Scale

Eon: Phanerozoic
Era: Paleozoic
Period: Silurian
Sub Period: None
Epoch: Přídolí

Stratigraphy

Leighton Formation

Provenance

Collector: Asher Michalski
Date Collected: 01/24/2021
Acquired by: Field Collection

Dimensions

Length: 7 mm
Width: 12 mm

Location

Penobscot County
Maine
United States

• brachiopod
• chonetes bastini
• leighton formation
• maine
• mainefossils
• pembroke formation
• silurian

Comments

Chonetes bastini was first described from the Leighton Fm, also called the Pembroke Fm. It is differentiated from other species by the number of spines and its finer more numerous striae. Most specimens are missing the hinge spines.   

The above pictures show the pedicle valve. A poorly preserved original or cast of the shell exterior is in the left side photo.  Some of the exterior of the shell may be missing since there is a horizontal groove above the shell where shell may have once filled it. The right photo shows an exterior impression or mold. 

Williams, Henry Shaler (1985). "New species of Silurian fossils from the Edmunds and Pembroke Formations of Washington County, Maine." Proceedings U.S. National Museum, 45, 319-358.

https://repository.si.edu/bitstream/handle/10088/14399/1/USNMP-45_1985_1913.pdf