''Agonum trigeminum'', also known as triple harp ground beetle, is a species of

ground beetle Ground beetles are a large, cosmopolitan distribution, cosmopolitan family (biology), family of beetles, the Carabidae, with more than 40,000 species worldwide, around 2,000 of which are found in North America and 2,700 in Europe. As of 2015, it ...

s, family Carabidae. It occurs in the eastern half of the North America in the

Eastern United States The Eastern United States, often abbreviated as simply the East, is a macroregion of the United States located to the east of the Mississippi River. It includes 17–26 states and Washington, D.C., the national capital. As of 2011, the Eastern ...

and

Eastern Canada Eastern Canada (, also the Eastern provinces, Canadian East or the East) is generally considered to be the region of Canada south of Hudson Bay/ Hudson Strait and east of Manitoba, consisting of the following provinces (from east to west): Newf ...

Description

''Agonum trigeminum'' measures in length and is deep black in color.

Ecology

It is associated with margins of eutrophic ponds and pools with dense vegetation.

References

trigeminum Beetles of North America Beetles described in 1954 {{Platyninae-stub