Pond-margin
Guides
Agonum trigeminum
triple harp ground beetle
Agonum trigeminum is a small ground beetle in the family Carabidae, measuring 8.3–10 mm in length. It is deep black in color and occurs in the eastern United States and eastern Canada. The species is associated with margins of eutrophic ponds and pools with dense vegetation. It is one of several Agonum species studied as part of predator communities in turfgrass ecosystems.
Peltodytes festivus
Peltodytes festivus is a species of crawling water beetle in the family Haliplidae. It occurs in North America. Members of this family are semi-aquatic, inhabiting the margins of ponds, lakes, and slow-moving streams where they feed on algae and detritus. The genus Peltodytes is distinguished from other haliplid genera by morphological features of the elytra and hind legs.