Cicindela repanda

Distinguished from similar species by the C-shaped humeral lunule on the elytra that does not curl forward on its inner edge (contrasting with the G-shaped marking of C. hirticollis). The shoulder marking touches or nearly touches the middle band. Compared to C. duodecimguttata, C. repanda has a lighter, more bronze coloration rather than dark coloration, and more extensive rather than reduced elytral maculae. The pronotum is coppery and hairy, versus the hairy-necked condition of C. hirticollis. The elytra are less coarsely punctate than those of Ellipsoptera cuprascens.

Adults measure 10–13 mm in length. The dorsal surface is bronze-brown, while ventral surfaces are metallic green or blue. The pronotum is coppery and hairy. The labrum is small with one tooth. Elytra display deep alveoli and acute ridges, with a gradual increase in reflectance toward near-infrared wavelengths producing a flat brown overall appearance; microscopic examination reveals subtle iridescence with mainly red reflected colors. The shoulder marking (humeral lunule) is C-shaped and touches or nearly touches the middle band. The proepisternum is bronze-brown with reddish reflections.

Primarily inhabits fluvial habitats including edges of lakes, ponds, and streams. Found on sand, gravel, or clay soil substrates, often directly along shorelines rather than inland. Occurs on sand dunes around the Great Lakes, particularly the Indiana Sand Dunes. Frequently found with C. duodecimguttata in clay silt stream beds or with C. hirticollis in sand substrate streams. Remarkably tolerant of substrate variation, observed on sand, mud, mixed substrates, and even concrete boat ramps (though larval burrows have not been confirmed in the latter).

Widely distributed across most of North America, including the United States and Canada. Common throughout eastern North America. Particularly abundant in the Great Lakes region. Three subspecies recognized: C. repanda repanda, C. repanda novascotiae, and C. repanda tanneri.

Adults are active primarily in spring and fall (spring-fall species), with peak populations in June and September. Adults emerge from hibernation in April, with numbers declining by early July. A new generation emerges from pupae in late August through September. Overwintering occurs as adults, with mating following in spring. The species has a predominantly two-year life cycle.

Opportunistic feeder, primarily predatory but also frugivorous. Adults feed on small arthropods including caddisflies, ants, and other insects; dead insects are readily accepted. Prey detection relies heavily on movement, though beetles have been observed capturing over 90% of prey in complete darkness, indicating multimodal sensory capabilities. Frugivory has been documented on fallen fruits of Sassafras albidum and Phytolacca americana (pokeweed), with no significant preference between high-fat and high-sugar fruits. Fruit feeding likely provides important nutrients during periods of low prey availability or high energy demands prior to overwintering.

Two-year life cycle typical. Adults are spring-fall species: larvae pupate and emerge in fall, overwinter as adults, and mate in spring. Some individuals may follow a summer pattern with adult emergence only in summer and overwintering as larvae. Overwintering requires cold temperature-induced diapause before mating. Larvae are found in sandy areas, digging vertical tunnels and lying in wait with modified heads near the surface to ambush passing prey.

Adults are diurnal predators that capture prey through high-speed chases rather than stealth. Pursuit involves intermittent stopping and running due to visual constraints at high angular velocities—when relative motion exceeds receptor acceptance limits, prey images blur, requiring pauses to re-focus. Adults exhibit thermoregulatory behaviors including stilting (elevating body on long legs), sun-facing, and shade-seeking. Less aggressive predatory behavior compared to congeners, with frequent retreat rather than capture in encounters; this may reflect adaptation to scavenging dead prey at water edges. Adults have been observed at ultraviolet lights at night, likely attracted by abundant prey. When feeding, adults hold antennae back against the head and pronotum, possibly to prevent damage from struggling prey.

Predator of small invertebrates in shoreline and riparian ecosystems. Larval and adult stages occupy different feeding niches, reducing intraspecific competition. High population densities and reliance on both living and dead prey may influence prey community structure in fluvial habitats. Serves as prey for various predators including wasps such as Cerceris fumipennis.

Subject of ecological and behavioral research, particularly regarding visual physiology, thermoregulation, and predator-prey dynamics. Popular among naturalists and photographers for its accessibility and charismatic behavior. Occasionally attracted to UV lights used for insect surveys. Not considered a pest species.

• Cicindela hirticollisSimilar size and habitat preference, but distinguished by G-shaped (not C-shaped) humeral lunule, more coppery body cast, and hairier neck region
• Cicindela duodecimguttataCo-occurs in similar habitats but has darker coloration, reduced elytral maculae broken into spots, and is less common in central North America
• Ellipsoptera cuprascensShares wet sand habitats but has more coarsely and densely punctate, shinier elytra with more distinctly coppery color; also readily attracted to UV lights at night

Long assumed to be an obligate predator, but research has demonstrated significant frugivory. Prior experimental results suggesting strict predation may have been biased by using satiated individuals that had already undergone post-hibernation feeding and rapid weight gain.

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