water beetle acilius sulcatus sits on leaves of water lily in garden pond. acilius sulcatus is species of water beetle

acilius animal antenna antennae arthropod background beatle beautiful beetle biology black brown bug closeup coleoptera copy crawling detail dive diving dytiscidae entomology environment family fauna focus freshwater full garden green ground imago insect insects leaves length lily macro natural nature one pond predator selective sits space species sulcatus swimming water waterlife wild wildlife yellow zoology