marsh beetle

Family Scirtidae, or Helodidae (marsh beetles) Small, oval; on vegetation in swampy places; aquatic larvae; about 600 species; widely distributed; example Scirtes. Superfamily Staphylinoidea Very large group; antennae with last 3 segments rarely club-shaped; outer skeleton rarely very hard, shiny; wing veins M (media) and Cu (cubitus) not connected;