Connecticut Department of Energy & Environmental Protection

Emergency Burn Ban In Effect 10/26/24 - An emergency burn ban is now in effect for all Connecticut State Parks, Forests, and Wildlife Management areas, prohibiting the use of all outdoor grills, firepits, and campfires, and the kindling and use of flame outdoors. DEEP and local agencies are working to contain several active fires across the state. Please avoid all affected State Parks and Forests, as well as the blue-blazed Mattabesett Trail. The Enduro Trail in Voluntown and portions of North Stonington within the Pachaug State Forest are closed at this time. Rocky Neck State Park is also closed until further notice due to a brush fire. Please note that today's forest fire danger report remains at a 'very high' or 'extreme' level. More information about the current fire danger, burn ban and recommended safety measures can be found here

Eastern Pearlshell

Margaritifera margaritifera

Species of Special Concern

Key Features

Size: Up to six inches.

Shape: Elongate. Older individuals often have a pronounced ventral curvature that gives them a slight “banana-shaped” appearance.

Periostracum: Thick. Dark. Shell rays absent. Color light brown (juveniles) to black (adults).

Lateral Teeth: Absent.

Pseudocardinal Teeth: Present and well developed—two on the left valve and one on the right valve.
Nacre: Usually white, with faints pits centrally located, each with a faint “tail” that points toward the beak cavity.

Often Confused With ... Eastern Elliptio

External shell of Eastern pearlshell

External shell

Internal shell, right valve of Eastern pearlshell

Internal shell, right valve

Close-up of pits on the nacre

Close-up of pits on the nacre

Hinge teeth of Eastern pearlshell

Hinge teeth

Range Map of Eastern PearlshellHabitat: The eastern pearlshell is found in streams and small rivers that support trout or salmon populations, and exists in a variety of substrate. This species is not found in lakes or ponds.

Range in Connecticut: The eastern pearlshell is found in most major watersheds in Connecticut, though it is most common in the northern and northwestern parts of the state.

Conservation: The eastern pearlshell is listed as special concern in Connecticut. The scarcity and continual loss of coldwater habitats in the State contribute to its rarity. It is more common in northern New England where there are more coldwater streams and rivers. Its host fishes include Atlantic salmon, brook trout and brown trout. Climate change may negatively affect this species if rivers become too warm to support trout or salmon.

Freshwater Mussel Fact Sheets

Eastern Pearlshell
Dwarf Wedgemussel
Triangle Floater
Brook Floater
Creeper
Eastern Elliptio
Eastern Floater
Alewife Floater
Eastern Pondmussel
Tidewater Mucket
Yellow Lampmussel
Eastern Lampmussel

The Freshwater Mussels of Connecticut

Content last updated on January 29, 2014.