Williamson's Emerald
- kingdom: Animalia
- phylum: Arthropoda
- class: Insecta
- order: Odonata
- family: Corduliidae
- genus: Somatochlora
- species: Somatochlora williamsoni
Tobermory
Ontario- Amqui
- Saint-Côme--Linière
Quebec
Canada
Stamford
Connecticut- Paxton
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United States