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Montana Field Guide

Montana Field Guides

A Peaclam - Pisidium ovum


Global Rank: GNR
State Rank: SNR

Agency Status
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USFS:
BLM:


 

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General Description
Fingernail clams are small "mostly about the size of a finger or thumbnail" bottom-dwelling, filter-feeders found in ponds, lakes and streams throughout Montana. They are native and can be quite abundant, providing food for a variety of animals and producing large accumulations of empty shells. These shells can be quite fragile compared to the introduced Asian clams , which have not be reported in Montana yet.

Range Comments
(Sterki 1916b) includes Montana in range; indicates collections were made in the Pacific drainage of the Bitterroot Valley at several locations.

Food Habits
Fingernail clams are mostly filter-feeders, siphoning in floating particulate organic materials ( small plant or animal) from the water column and straining out the particles and expel the strained water. Pedal feeding from the bottom with the foot muscle has also been observed.

References
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Citation for data on this website:
A Peaclam — Pisidium ovum.  Montana Field Guide.  .  Retrieved on , from