U.S. Fish & Wildlife Service
U.S. Fish & Wildlife Service ECOS
  1. ECOS

Dwarf wedgemussel (Alasmidonta heterodon)

Listing Status: Endangered

Where Listed: WHEREVER FOUND

General Information

The species historical range included Connecticut, Delaware, District of Columbia, Maryland, Massachusetts, New Hampshire, New Jersey, New York, North Carolina, Pennsylvania, Vermont, Virginia. See below for information about where the species is known or believed to occur.

Current Listing Status Summary

» Range Information

Current Range
Last Updated: 04-21-2025 - Wherever found
Zoom in! Some species' locations may be small and hard to see from a wide perspective. To narrow-in on locations, check the state and county lists (below) and then use the zoom tool.
Want the FWS's current range for all species? Click here to download a zip file containing all individual shapefiles and metadata for all species.
* For consultation needs do not use only this current range map, please use IPaC.

Current range maps are only shown within the jurisdictional boundaries of the United States of America. The species may also occur outside this region.

  • Wherever found

    Listing status: Endangered

    • States/US Territories in which this population is known to or is believed to occur: Connecticut, Delaware, Maryland, Massachusetts, New Hampshire, New Jersey, New York, North Carolina, Pennsylvania, Vermont, Virginia
    • US Counties in which this population is known to or is believed to occur: View All
    • USFWS Refuges in which this population is known to occur: Silvio O. Conte National Fish and Wildlife Refuge
    • Countries in which this population is known to occur: Canada, United States

» Candidate Information

No Candidate information available for this species.

No Candidate Assessments available for this species.

No Candidate Notice of Review Documents currently available for this species.

No Uplisting Documents currently available for this species.

» Federal Register Documents

Federal Register Documents

» Species Status Assessments (SSAs)

Species Status Assessments (SSAs)

No Species Status Assessments (SSA's) are currently available for this species.

Special Rule Publications

No Special Rule Publications currently available for this species.

» Conservation Plans

No Conservation Plans currently available for this species.

» Petitions

» Biological Opinions

To see all FWS Issued Biological Opinions please visit the BO Report.

» Life History

No Life History information has been entered into this system for this species.

» Other Resources

NatureServe Explorer Species Reports-- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.

ITIS Reports-- ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of North America and the world.

FWS Digital Media Library -- The U.S. Fish and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video." +

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