Belostoma flumineum is a North American species of giant water bug (family Belostomatidae).

The mouth parts consist of a stout syringe-like rostrum or beak and long piercing stylets that were once mandibles and maxillae.

[3] Belostoma flumineum are commonly found in wetlands, marshes and ponds throughout North America.

[2] Common species that B. flumineum prey upon are backswimmers, water boatmen, dragonfly nymphs, and snails.

[5] Belostoma flumineum females lay their eggs on the backs of their mates and from this point onward it is the males' job to care for them until they hatch in 7–14 days.

[7] The males must remain at the air-water interface so that the eggs are provided with enough oxygen, this behavior is called air brooding.

They did find statistically significant differences between the life spans of virgin and breeding in both males and females.