Acilius semisulcatus
- kingdom: Animalia
- phylum: Arthropoda
- class: Insecta
- order: Coleoptera
- family: Dytiscidae
- genus: Acilius
- species: Acilius semisulcatus
Blackfalds- Leduc
Alberta- Winnipeg
Manitoba- Hay River
Northwest Territories
Canada
Chicago- Evergreen Park
- Palos Park
Illinois- Greenfield
- Marion
- Marion Center
- West Concord
Massachusetts- Brentwood
New Hampshire- Emerson
- Oradell
- River Vale
- Westwood
New Jersey- Sodus
- Staten Island
New York- Erie
Pennsylvania- Seattle
Washington- Oshkosh
Wisconsin
United States