Eunota circumpicta

(LaFerté-Sénectère, 1841)

cream-edged tiger beetle

Eunota circumpicta, the cream-edged , is a halophilic to the United States with a broader range extending south to Brazil. Formerly classified in Cicindela and Habroscelimorpha, this species has been reclassified to Eunota based on molecular . Two are recognized: E. c. circumpicta and E. c. johnsonii (Johnson's tiger beetle). The species is closely related to E. mecocheila, from which it is distinguished by morphological and genetic differences. It inhabits saline flats and coastal areas, showing activity both day and night.

Pronunciation

How to pronounce Eunota circumpicta: //juːˈnoʊtə ˌsɜːrkəmˈpɪktə//

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Identification

Distinguished from the closely related E. mecocheila by its shorter (length/width ratio 0.35–0.50 vs. 0.55–0.70) and larger body size. The cream or elytral margins separate it from many . Where overlapping with E. severa and E. togata in coastal areas, identification requires examination of specific morphological characters. The E. c. johnsonii occurs in inland saline of the southwestern United States.

Habitat

Open or sparsely vegetated muddy or sandy saline including salt flats, alkaline lakes, and coastal areas. Inland occupy saline flats and alkaline lake margins; coastal populations occur in saline coastal habitats where they may overlap with related .

Distribution

to the United States with range extending from the southern United States south to Brazil. Highest diversity in northern Mexico. Two : E. c. circumpicta (coastal and general distribution) and E. c. johnsonii (inland saline of southwestern United States, including New Mexico).

Seasonality

Active from June to mid-August according to some sources; however, field observations indicate activity in spring and fall as well, with some showing extended activity periods. The is active both diurnally and nocturnally.

Behavior

Active both during the day and at night. have been observed scavenging on and matter on the ground. Shows -seeking during peak heat. distribution with putative close relatives except in coastal areas where range overlaps with E. severa and E. togata.

Ecological Role

As a predatory , likely functions as an in saline . Habitat partitioning with other occurs through microhabitat selection and seasonal activity patterns.

Human Relevance

Subject of entomological study and photography due to its distinctive appearance. Formerly placed in different , illustrating taxonomic revisions based on molecular data. No significant agricultural or economic impact documented.

Similar Taxa

Eunota mecocheilaClosely related sister distinguished by longer (length/width ratio 0.55–0.70), smaller body size (10.2–12.0 mm), and restricted distribution in northern Mexico (Coahuila)
Eunota togataOverlaps in coastal saline ; distinguished by elytral pattern and body proportions
Eunota severaOverlaps in coastal areas; distinguished by specific morphological characters of and coloration

More Details

Taxonomic History

Originally described as Cicindela circumpicta by LaFerté-Sénectère in 1841, later transferred to Habroscelimorpha circumpicta, and currently placed in Eunota based on phylogenetic analysis showing 3.3% genetic divergence in b from its sister E. mecocheila.

Subspecies

Two recognized: E. c. circumpicta (nominate form) and E. c. johnsonii (Johnson's ), the latter occurring in inland saline of the southwestern United States and distinguished by green coloration in some individuals.