Astata

Latreille, 1796

Species Guides

2

Astata is a of solitary predatory in the Astatinae, Crabronidae. With 87 recognized and worldwide, it is the largest genus in its subfamily. The genus is distinguished by distinctive wing venation patterns and pronounced in structure. Males possess exceptionally large that meet dorsally at the top of the , while females have normal, separated eyes.

Pronunciation

How to pronounce Astata: /æsˈtɑːtə/

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Identification

Distinguished from the related Dryudella by wing venation patterns and larger body size in most North American . Males of Astata lack the white facial markings present in Dryudella males. The dorsally meeting of males are unique among sympatric crabronid . Females may be distinguished from other soil-nesting wasps by their without tarsal rakes on the forelegs—unlike sand wasps, they pull soil rather than rake it.

Appearance

Medium-sized , with of Astata unicolor reaching approximately 1 cm in length. Males exhibit dramatically enlarged that wrap around and meet broadly at the crown of the , creating a contiguous surface. Females have normal, separated eyes. Both sexes possess broad hind wings, more pronounced in males. The is typically orange or black. Wing venation features are diagnostic for the . Males lack the white facial markings sometimes present in the related genus Dryudella.

Habitat

Open fields and areas with hard-packed or sandy soil suitable for nesting. Some perch on elevated substrates including twig tips and dried flower ; others perch on ground-level stones or bare ground. Associated with supporting Pentatomidae prey. In Oregon, observed in residential gardens. documented on topographic summits in central Arizona.

Distribution

distribution with 87 and worldwide. Documented from North America (14 species north of Mexico), Europe, and other regions. Specific records include: Oregon (A. unicolor), central Arizona, and Scandinavian countries (Denmark, Norway, Sweden).

Seasonality

activity documented from July through September in Oregon . Males perch during late morning and early afternoon hours in the Sonoran Desert.

Diet

Specialized of Pentatomidae (stink bugs). Prey includes and nymphs. Astata unicolor has been documented preying on Halyomorpha halys (brown marmorated stink bug), Banasa dimidiata, Chlorochroa ligata, and occasionally Boisea rubrolineata (western boxelder bug).

Host Associations

Life Cycle

Solitary nesting in soil burrows. Females excavate multi-celled tunnels partitioned with mud curtains into several chambers. Each is provisioned with multiple paralyzed stink bugs before an is laid. Larvae develop on the fresh prey provisions. No tarsal rakes on forelegs; females pull soil during excavation rather than rake it.

Behavior

Males perch conspicuously on elevated substrates (twig tips, dried flower , or ground-level stones) and exhibit rapid, evasive when disturbed, often returning to the same or nearby perches. observed: males aggregate at topographic summits as a mate-location strategy. Females hunt by paralyzing prey with a sting, dragging it to the nest, and provisioning . Both sexes visit flowers for nectar.

Ecological Role

of stink bugs, including . Potential native agent for Halyomorpha halys. Local impact on prey through multiple provisioning events per season.

Human Relevance

Investigated as a native biocontrol agent for the brown marmorated stink bug (Halyomorpha halys) in Oregon. Limited practical application currently due to specialized nesting requirements and difficulty in studying the . First documented in association with this pest by a citizen scientist in Portland, Oregon in 2013, leading to formal research collaboration.

Similar Taxa

  • DryudellaSister in Astatinae; distinguished by smaller size, white facial markings in males, and different wing venation
  • BicyrtesAlso hunts stink bugs but belongs to different tribe (Bembicini); lacks the extreme male enlargement of Astata

More Details

Male mate-location strategies

Males employ two distinct mate-location strategies: perching on landmarks (twigs, flower , stones) and on topographic summits. Whether perching males locate females visually or through other cues remains unknown.

Research challenges

The is difficult to study due to rapid , solitary , and specialized nesting requirements. Attempts to trap individuals using tethered prey have been thwarted by the 's ability to escape with prey while leaving trapping equipment behind.

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Sources and further reading