Invertebrates
American Rubyspot
Hetaerina americana · also called American rubyspots
Sunlight catches the base of a damselfly’s wings as it perches on a rock at the edge of a flowing stream, revealing a patch of deep ruby red vivid enough to be visible from well across the water, the unmistakable mark of an American rubyspot defending its stretch of shoreline.
Overview
The American rubyspot, Hetaerina americana, is a damselfly native to flowing stream and river habitat across a broad range spanning much of the United States and Mexico. Its striking ruby-red wing patches, metallic bronze or green body, and strong preference for moving water over still ponds make it one of the more visually distinctive and habitat-specific damselflies in North America.
A damselfly that chose the moving water
While many of its damselfly relatives settle for the calm of a still pond, the American rubyspot has built its entire territorial and hunting strategy around flowing streams, a habitat choice reflected in both its behaviour and its preference for perches right at the water’s moving edge.
Status
Least Concern — widespread and stable across suitable flowing stream and river habitat throughout much of the United States and Mexico.
American Rubyspot: common questions
Why is it called the American rubyspot?
This species displays a distinctive deep ruby-red patch at the base of each wing, a bold colour visible even from a distance in bright sunlight along a stream, and this striking marking is exactly what gave the species its common name.
Why does the American rubyspot prefer streams over ponds?
Unlike many damselflies that favour still water such as ponds and marshes, this species is specifically adapted to flowing stream and river habitat, likely because its hunting and territorial behaviour, including males defending stretches of stream edge, are better suited to the linear, moving-water structure of a stream than the open expanse of a still pond.
How do male American rubyspots defend territory?
Adult males stake out and defend small territories along stream edges, typically perching on emergent vegetation or rocks near the water, chasing off rival males that intrude while waiting for females to arrive, a common territorial pattern among many damselfly species that rely on defending prime waterside real estate.
How can you identify an American rubyspot?
Look for a deep ruby-red patch at the base of each wing combined with a metallic bronze or green body in males, a striking colour combination that, together with its relatively large size for a damselfly, makes this species one of the more visually distinctive damselflies found along North American streams.