Cicindela repanda tanneri

The C-shaped humeral lunule is the most reliable character to distinguish C. repanda from the similar C. hirticollis, which has a G-shaped marking with a posterior portion that angles sharply anteriorly on its inner edge. C. repanda also tends to have a slightly less stocky build and somewhat less bold white markings compared to C. hirticollis. C. duodecimguttata (12-spotted Tiger Beetle) is darker in coloration with reduced, broken elytral markings forming six spots on each elytron. C. repanda shows remarkably little geographic variation across its range, making subspecies identification challenging without detailed examination.

Adults typically measure 11–14 mm in body length. The body is bronze to coppery-brown in coloration with distinct ivory or white markings on the elytra. The humeral lunule (the white marking on the shoulder of the elytra just behind the pronotum) is C-shaped and never curls forward on its inner edge—this distinguishes it from similar species such as Cicindela hirticollis, which has a G-shaped humeral lunule. The body is covered with white hairs that provide insulation from solar heating. Large compound eyes, long slender legs, and prominent sickle-shaped mandibles are characteristic features.

Occurs in nearly any near-water habitat regardless of soil type: sand, mud, clay, or mixtures thereof. Found along streams, rivers, ponds, and lakeshores. In Missouri and Oklahoma, populations favor dry upland sand and clay sites as well as wet bottomland sand sites. Also recorded from lawns, agricultural fields, dirt roads, gravel parking lots, and concrete surfaces (though larval burrows have not been found in concrete habitats).

Recorded from Canada and the United States. The nominate subspecies C. repanda occurs across much of eastern North America and has failed to colonize the Pacific Coast despite its widespread distribution. The subspecies tanneri has been documented in western regions including Colorado.

Adults are active from spring through fall, with activity generally occurring when temperatures routinely surpass the freezing point (approximately April through November in Missouri). Adults are not active during winter months. The species exhibits a spring-fall adult activity pattern, spending summer months as larvae and pupae in soil burrows.

Adults are predatory, pursuing small invertebrates including ants and caddisflies. They have been observed feeding on caddisflies attracted to ultraviolet lights at night. Larvae are sedentary ambush predators that seize prey passing near their burrow entrances.

Larvae construct vertical burrows in soil where they live as ambush predators, presenting their flat heads at the burrow entrance. They enlarge galleries as they grow. Pupation occurs in the burrow. The species exhibits a spring-fall adult activity pattern with summer spent in larval and pupal stages. Larvae have been observed to survive 60–120 hours of submersion during flooding by switching to anaerobic metabolism; some species in this group relocate to drier soils when moisture levels become excessive.

Adults are fast-running, visually oriented predators that pursue prey in short bursts interspersed with stops to re-focus, as their speed can exceed their visual processing capacity. When disturbed, they fly short distances and alight facing the threat, reducing their profile. They exhibit thermoregulatory behaviors including stilting (elevating the body on long legs to reduce ground contact), sun-facing (orienting the body to minimize solar exposure), and shade-seeking beneath vegetation. Adults hold antennae back against the head and pronotum while feeding, possibly to prevent damage from struggling prey. They become wary and difficult to approach in hot, sunny conditions with little cover.

Predator of small invertebrates in riparian and near-water habitats. Larvae serve as prey for other organisms. Their burrowing activity contributes to soil aeration and nutrient cycling in sandy and muddy substrates.

Subject of ecological and behavioral research, particularly regarding flood tolerance and habitat requirements. Popular among entomologists and naturalists for observation and photography, though their wariness makes close approach challenging. Indicator species for riparian ecosystem health; vulnerable to habitat alteration from dam construction, soil compaction by foot traffic, and shoreline development.

• Cicindela hirticollisSimilar size, coloration, and habitat preference along large rivers; distinguished by G-shaped (vs. C-shaped) humeral lunule, stockier build, and bolder white markings. In Missouri, C. hirticollis is less abundant and restricted to wet sand habitats along major rivers.
• Cicindela duodecimguttataCo-occurs in near-water habitats; distinguished by darker overall coloration and reduced, broken elytral markings forming six spots per elytron. More closely related to C. oregona than to C. repanda.

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
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