Numbers
42 species in North American (
nearctica.com)
Identification
adults have 5 longitudinal grooves in the pronotum
Habitat
on or around submerged or emergent vegetation in standing or slow-moving water
Internet References
live adult image and description of
Helophorus species (Cheryl Podemski, U. of Alberta)
pinned adult image of
Helophorus species (Insects of Cedar Creek, Minnesota)
adult drawing of
H. marginicollis (Mississippi State U.)
adult image of the holarctic species
H. aquaticus (Invertebrates of the Baikal region, Siberia)
