Taxonomy
- Kingdom: Animalia
- Phylum: Arthropoda
- Class: Insecta
- Order: Odonata
- Suborder: Anisoptera
- Family: Libellulidae
- Genus: Sympetrum
- Species: S. ambiguum
- Authority: (Hagen, 1861)
Common name
Blue‑faced meadowhawk
Description
Sympetrum ambiguum is a medium‑sized dragonfly, typically measuring 30–35 mm in total length. Adult males are distinguished by a vivid blue facial coloration, a black thorax with subtle orange markings, and a predominantly black abdomen bearing small orange spots on the dorsal plates of several segments. Females and immature individuals (teneral and teneral females) have a more muted brown or olive facial hue, with the abdomen displaying a brownish‑gray base color and more extensive orange markings. The wings are clear with a faint amber tint near the base, and the wing venation is characteristic of the genus Sympetrum.
Distribution
The species is native to North America. Its range extends throughout the eastern United States, from the New England states southward to the Gulf Coast, and westward to the central Midwest. It is also found in southern Canada, particularly in Ontario and Quebec.
Habitat
Sympetrum ambiguum inhabits a variety of freshwater environments, including ponds, lakes, slow‑moving rivers, marshes, and temporary pools. It prefers open, sunlit areas with abundant emergent vegetation where it can perch and hunt.
Life cycle and behavior
- Reproduction: Males establish and defend territories near suitable oviposition sites. Mating occurs in flight, after which the female deposits eggs in shallow water or on emergent plant material.
- Development: Eggs hatch within a few days to weeks, depending on temperature. Larvae (nymphs) are aquatic predators, residing in benthic substrates and feeding on small invertebrates. The larval period can last one to two years, after which the nymph emerges from the water, undergoes a final molt, and becomes an adult.
- Flight period: Adults are typically on the wing from late spring through early autumn, with peak abundance in midsummer.
Conservation status
The International Union for Conservation of Nature (IUCN) has not listed Sympetrum ambiguum as a threatened species. It is generally considered common and widespread within its range, and no major population declines have been documented.
References
- Dunkle, S. W. (2000). Dragonflies through Binoculars. Oxford University Press.
- Paulson, D. R. (2011). Dragonflies and Damselflies of the East. Princeton University Press.
- North American Odonata (OdonataCentral) database, species account for Sympetrum ambiguum.
This entry provides a concise overview of the species based on established entomological literature and reputable databases.
