Common name: Dwarf Wedgemussel
Scientific name: Alasmidonta heterodon (I. Lea, 1829)

Class:
Bivalvia (Bivalves)
Order:
Unionoida (Freshwater Mussels)
Family:
Unionidae (Unionid Mussels)
Synonyms:
Other common names:

Habitat type(s):
Habitat description(s)
Riverine:
BIG RIVER, MEDIUM RIVER, CREEK, Moderate gradient

Ecological systems and subsytems (about):
RIVERINE - NATURAL STREAMS:
Confined river (guide)
The aquatic community of relatively large, fast flowing sections of streams with a moderate to gentle gradient.
RIVERINE - NATURAL STREAMS:
Deepwater river*
The aquatic community of very large, very deep, quiet, base level sections of streams with a very low gradient. In places the water is deep enough so that light cannot reach the river bottom.

* probable association but not confirmed.


Conservation:
Global conservation status rank:
G1G2
Critically Imperiled or Imperiled globally - At very high or high risk of extinction due to rarity or other factors; typically 20 or fewer populations or locations in the world, very few individuals, very restricted range, few remaining acres (or miles of stream), and/or steep declines. More information is needed to assign either G1 or G2.
State conservation status rank:
S1
Critically Imperiled in New York - Especially vulnerable to disappearing from New York due to extreme rarity or other factors; typically 5 or fewer populations or locations in New York, very few individuals, very restricted range, very few remaining acres (or miles of stream), and/or very steep declines.
Federal protection:
Endangered
Listed as Endangered under the Federal Endangered Species Act
State protection:
Endangered
Listed as Endangered by New York State: in imminent danger of extirpation in New York. For animals, taking, importation, transportation, or possession is prohibited, except under license or permit. For plants, removal or damage without the consent of the landowner is prohibited.
SGCN:
NYNHP track status:
Y: Track all extant and selected historical EOs

More information:
Conservation guide:
https://guides.nynhp.org/dwarf-wedgemussel/
NatureServe explorer link:
https://explorer.natureserve.org/Taxon/ELEMENT_GLOBAL.2.108301/Alasmidonta_heterodon/