About Cordulia shurtleffii Scudder, 1866
American emerald, whose scientific name is Cordulia shurtleffii Scudder, 1866, is a species of dragonfly native to North America. Its body is mostly black, and it has a distinct yellow ring between its second and third abdominal segments. This dragonfly is distributed across Canada and the northern United States. Adult individuals of this species typically have a body length between 1.7 and 2.0 inches.