Cicindela willistoni

LeConte, 1879

Williston's Tiger Beetle

Species Guides

7

Cicindela willistoni is a tiger restricted to saline and alkali flats in the southwestern United States. and larvae occur on open, sparsely vegetated salt flats where they occupy distinct microhabitats. The larvae construct unique chimney-like turrets above their burrow entrances, an that facilitates and prey attraction. Adult is triggered by summer monsoonal rains, resulting in a relatively short active season.

Pronunciation

How to pronounce Cicindela willistoni: /sɪˈsɪndələ wɪˈlɪstəni/

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Identification

of C. willistoni can be distinguished from sympatric tiger beetles by their strong preference for the water's edge in saline , as opposed to more inland positions occupied by related . The C. willistoni estancia exhibits particularly striking coloration. Larvae are readily identified by their distinctive turret-building —constructing chimney-like extensions 1–4 cm above the burrow entrance, a trait unique among tiger beetles.

Habitat

Exclusively saline and alkali flats with little or no vegetation. occur primarily along the water's edge of salt lakes and playas. The shows strong microhabitat fidelity, with adults occupying wet mud and damp sand immediately adjacent to water in contrast to sympatric species that utilize drier zones further inland.

Distribution

Southwestern United States, including Arizona and New Mexico. Records from Torrance County, New Mexico (Laguna del Perro region) and Sulphur Springs Valley, Arizona. The C. willistoni estancia occurs in the Laguna del Perro region of New Mexico.

Seasonality

are active during the post-monsoonal period, with triggered by summer monsoonal rains. Observations from New Mexico document activity in July following monsoon events.

Life Cycle

Larvae construct permanent burrows in the substrate of saline flats, with a characteristic chimney-like turret extending 1–4 cm above the surface. The larval stage occupies the same saline as .

Behavior

Larvae build and maintain turret structures above their burrow entrances. These turrets serve two documented functions: elevating larvae above the substrate boundary layer to access cooler temperatures for , thereby extending daily activity periods; and casting shade that attracts greater numbers of potential prey items to the burrow vicinity. are fast-running typical of the .

Ecological Role

in saline flat . Larvae function as sit-and-wait predators that capture prey attracted to their shaded turret vicinity. The participates in partitioning , with specializing on the water's edge microhabitat while coexisting with other tiger species occupying adjacent zones.

Human Relevance

Subject of ecological research on partitioning and microhabitat specialization. The C. willistoni estancia is noted for its attractive appearance among tiger enthusiasts.

Similar Taxa

  • Cicindela (Cicindelidia) nigrocoeruleaOccurs sympatrically but occupies damp sand 10–20 m from water's edge rather than immediately at the water's edge
  • Ellipsoptera nevadicaAlso occurs along water's edge in saline , but distinguished by different microhabitat utilization patterns within the same zone
  • Eunota togata fascinansOccurs in unvegetated areas near water but not exclusively at the water's edge; shows broader microhabitat

More Details

Turret Function Research

A study in Sulphur Springs Valley, Arizona tested multiple hypotheses for larval turret function. Flooding prevention, defense, and prey size differentiation were not supported. and prey attraction via shading were confirmed as the primary functions.

Habitat Partitioning

At Laguna del Perro, New Mexico, eight sympatric tiger partition the salt flat into distinct microhabitats. C. willistoni estancia is restricted to the water's edge, while other species occupy zones ranging from 10–20 m inland to dry vegetated areas and roadside habitats.

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Sources and further reading