view of giant black water beetle (hydrophilus triangularis) from the upper surface (dorsal view).

giant black water beetle hydrophilus triangularis family hydrophilidae scavenger scavenger hydrophilids largest aquatic wide distribution fresh water deep ponds lighted sidewalks night larvae nature antennae animal small invertebrates insects snails tadpoles fish scavenge decaying plant material debris predator adaptation supply surfacing air bubble underwater oxygen store hairs body frequent trips exchange tropics elongated narrow head north america rain pool forests