This beetle was photographed in the small stream at Mormon Hollow. Its overall occurrence at FNA is not known.

All adult predaceous diving beetles are aquatic and good swimmers. They prefer shallow bodies of water. Adults are active during daytime and spend most of the time underwater. Adults use their hindlegs for swimming and use them together like oars. Water scavenger beetles, in contrast, swim by moving their legs alternatively. These beetles are predaceous and feed on dragonfly and damselfly nymphs as well as the adults of various insects.