Black sea hydrozoan
- kingdom: Animalia
- phylum: Cnidaria
- class: Hydrozoa
- order: Leptothecata
- family: Campanulariidae
- genus: Obelia
- species: Obelia longissima
Puerto Montt
Los Lagos Region
Chile
Muroran
Hokkaido
Japan
Lysekil
Västra Götaland
Sweden
Albany- Redwood City
California- West Haven
Connecticut
United States