Arroyo Bluet

enallagma praevarum

The Arroyo Bluet (Enallagma praevarum) is an enchanting damselfly that brings a flash of brilliant blue to the arid and semi-arid waterways of western North America. Belonging to the family Coenagrionidae, these slender, delicate insects are frequently observed fluttering gracefully just above the water's surface or perched on low vegetation near streams and desert springs. Known for their active, low-altitude flights, Arroyo Bluets are key indicators of healthy freshwater ecosystems. Watching them hover and dart reveals a master of aerial maneuverability, as they patrol their small territories and seek out mates under the bright desert sun.

Habitat: Typically found around slowly moving streams, desert arroyos, marshy ponds, and spring-fed wetlands in arid or semi-arid landscapes.

Appearance

Adult male Arroyo Bluets are characterized by their vibrant sky-blue abdomen paired with intricate black rings and markings, culminating in a blue tip on the final segments. Their thorax features a distinctive blue-and-black striped pattern, and their eyes are a striking blue. Females exhibit a much more subdued coloration, often appearing in shades of tan, pale green, or dull blue with dark dorsal markings. They are small damselflies, measuring roughly 3 to 4 centimeters in length, with narrow, clear wings that they fold neatly along their backs when at rest.

KingdomAnimaliaPhylumArthropodaClassInsectaOrderOdonataFamilyCoenagrionidaeGenusEnallagma

Arroyo Bluet

Interesting facts

During mating, the pair forms a heart-like shape known as a 'mating wheel' while flying or resting on streamside vegetation.

Like other damselflies, Arroyo Bluets can rotate their heads almost 360 degrees to spot prey and predators in any direction.

Male Arroyo Bluets are highly territorial and will aggressively defend a choice patch of stream-side reeds from other males.

Special abilities

Capable of hovering in place, flying backward, and making sudden, rapid changes of direction to evade predators or capture tiny flying insects.

Males often remain attached to females in a tandem link while eggs are laid, guarding them against rival males and ensuring safe deposition into aquatic plants.

In their larval stage, they possess caudal gills that extract oxygen from water, allowing them to thrive in slow-moving, oxygen-depleted desert pools.

Measurements & details

Length: 3+ cm
Wingspan: 3+ cm
Weight: 0.00005+ kg
Lifespan: 1+ years
Top Speed: 12 km/h
Clutch Size: 100+
Incubation: 10+ days

Diet & Feeding

As both nymphs and adults, they are voracious predators of small invertebrates, playing a crucial role in controlling mosquito and gnat populations.

Age differences: Nymphs are aquatic generalists that ambush underwater invertebrates and tiny fish, whereas adults fly to pursue and capture aerial insects.