Dielis tolteca

Saussure, 1857

Toltec scoliid wasp

Dielis tolteca is a of scoliid native to western North America and Mesoamerica. The species is known to parasitize scarab beetle , with females hunting underground to provision their offspring. have been observed feeding on flowering plants, particularly mustards (Brassicaceae) and goldenrods (Solidago). The species has been documented in McInnis Canyons National Conservation Area in western Colorado, where it is active as a spring-emerging species.

Dielis tolteca - inat 150788417 by {{{name}}}. Used under a CC BY 4.0 license.Wasp Close-Up by Tdlucas5000. Used under a CC BY-SA 4.0 license.Dielis tolteca - 50768627422 by cricketsblog. Used under a CC BY 2.0 license.

Pronunciation

How to pronounce Dielis tolteca: /ˈdiː.e.lɪs tɔlˈtɛ.kə/

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Identification

Large-bodied with distinctive coloration; males possess long and a slender body with a terminal "pseudostinger," while females are more robust with shorter antennae and a functional retractable stinger. The can be distinguished from similar scoliids by its geographic range and seasonal activity pattern in the Colorado Plateau region.

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Habitat

Arid and semi-arid landscapes of western North America; documented from riparian corridors along the Colorado River to montane regions. In Colorado, occurs in McInnis Canyons National Conservation Area.

Distribution

North America and northern Neotropics: United States (western Colorado, Arizona), Mexico (widespread including Baja California, Sonora, Chihuahua, and southern states), Guatemala, El Salvador, Honduras, Nicaragua, and Haiti.

Seasonality

Spring-emerging ; activity documented in spring months in western Colorado, with observations on flowering mustards during this period.

Diet

feed on nectar from flowering plants, particularly mustards (Brassicaceae) and Solidago. Larvae are of scarab beetle (Scarabaeidae), feeding externally on the after hatching from laid on paralyzed larvae.

Host Associations

  • Scarabaeidae - larval ; females parasitize

Life Cycle

Females excavate scarab beetle , sting them into temporary paralysis, and deposit a single on each . The larva hatches and feeds externally as a , eventually killing the host. Development completes within the host burrow; emerge in spring.

Behavior

Females are solitary hunters that dig for scarab beetle in soil. of both sexes visit flowers for nectar. Males are frequently observed patrolling flowering vegetation.

Ecological Role

agent of scarab beetle ; contributes to regulation of soil-dwelling scarab larvae that may damage plant roots.

Human Relevance

Potential value in for scarab pests; subject of biodiversity documentation efforts in under-surveyed regions of western Colorado.

Similar Taxa

  • Campsomeris ephippiumSimilar size and coloration; distinguished by geographic distribution and male structure. C. ephippium has been recorded recently in Arizona and was historically known only from south Texas and south to Ecuador.
  • Other Dielis species Dielis has been inferred to be non-monophyletic in phylogenetic studies; -level identification requires examination of morphological details and geographic context.

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