Physiological Activity Of Water Beetle Defensive Agents. Haliplus stagninus is a species of crawling water beetle in the family Haliplidae. Acilius sulcatus is a species of water beetle in family Dytiscidae. Megadytes ducalis is a species of water beetle in the family Dytiscidae. Rhantus tigris is a species of water beetle in the family Dytiscidae. Suphisellus remator is a species of burrowing water beetle in the subfamily Noterinae. Canthydrus festivus is a species of burrowing water beetle in the family Noteridae. Suphisellus bruchi is a species of burrowing water beetle in the subfamily Noterinae. Suphisellus globosus is a species of burrowing water beetle in the subfamily Noterinae. In the 12th century, an illustrated astronomical manuscript shows it as a water beetle. The water bug or water beetle is known as "alukap" in Ilokano language. They also contain the only Irish modern-day record of the cave-dwelling water beetle (Agapus biguttatus). Thomas also leaves Harry the keys to the ""Water Beetle"" as a place to stay.