Emerald Spreadwing

The Emerald Spreadwing is a damselfly in the spreadwing family (Lestidae), found across much of northern North America as well as parts of Europe and Asia, making it one of the more widely distributed spreadwing species in the Northern Hemisphere. It is closely related to and often confused with the Common Spreadwing, sharing a similar metallic green coloration and habitat preference for temporary wetlands.

As its name suggests, the Emerald Spreadwing displays a bright metallic green sheen on the top of the thorax and abdomen, with mature males developing pale blue pruinescence on parts of the body. It is a relatively robust spreadwing, slightly stockier than some related species, and like other members of its family, it rests with its wings partially open rather than closed flat.

The species is particularly associated with shallow, often temporary or seasonal ponds and marshes, habitats that dry out later in the year, and its eggs are adapted to survive dry periods, allowing rapid colonization once water returns. This makes the Emerald Spreadwing an important predator in ephemeral wetland ecosystems that many other odonates cannot exploit.

• Metallic green to bronze-green coloring on top of the thorax and abdomen
• Pale cream to tan stripes along the sides of the thorax
• Mature males show pale blue-gray pruinescence on parts of the thorax and abdomen tip
• Relatively robust, thick-bodied build compared to some other spreadwings
• Wings held open at an angle when perched, characteristic of the spreadwing family
• Lookalikes: very similar to the Common Spreadwing and other Lestes species; the shape of the male's terminal appendages (cerci) is typically needed to confirm identification with certainty

Emerald Spreadwings favor shallow, often temporary or seasonal ponds, marshes, and wet meadows, frequently in open, sunny settings with grassy or sedge-dominated margins. The species has a broad Holarctic distribution, occurring across much of Canada and the northern United States as well as parts of Europe and Asia. Adults are typically seen in late spring through mid-summer, timed to exploit temporary waters before they dry.

Adults perch on grasses and sedges near water with the wings spread open, occasionally making short flights to capture small flying insects. Nymphs live among submerged vegetation in shallow water, where they ambush tiny aquatic invertebrates. Because it favors temporary wetlands that dry out seasonally, the Emerald Spreadwing benefits from reduced competition and predation compared to permanent-water species, and it plays an important ecological role as a predator of small insects in these seasonal habitats while also serving as prey for birds and other predators.

The Emerald Spreadwing develops through incomplete metamorphosis, with egg, aquatic nymph, and adult stages. Females typically lay eggs into plant stems in or near the water in summer or fall, and the eggs can enter a dormant state capable of surviving the pond drying out, hatching the following spring when water returns. Nymphs then develop quickly in the temporary pond, feeding on small aquatic invertebrates and molting repeatedly, racing to complete development and emerge as winged adults before the habitat dries again later in the season. This rapid, drought-adapted life cycle is a defining feature of the spreadwing family and allows the Emerald Spreadwing to thrive in seasonal wetlands.