Gasteruption assectator
(Linnaeus, 1758)
wild carrot wasp
Gasteruption assectator, commonly known as the wild carrot wasp, is a of carrot wasp in the Gasteruptiidae. It is a that targets multiple and species including Hylaeus confusus, Hylaeus pectoralis, and Pemphredon fabricii. The species exhibits the distinctive elongated neck and enlarged hind tibiae characteristic of its family. are frequently observed at flowers, particularly umbelliferous blooms.
Pronunciation
How to pronounce Gasteruption assectator: //ɡæsˈtɛrʌpʃən æsˈsɛktətɔːr//
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Identification
Distinguished from ichneumon wasps by fewer antennal segments (13–14 versus many more in ichneumons) and swollen hind tibiae. Separated from sphecid such as Ammophila by the pronounced neck and high abdominal attachment. -level identification relies on texture and, to a lesser extent, color pattern.
Images
Appearance
Slender with elongated, thread-like body. Pronounced "neck" (constricted petiole) between and . attached high on thorax, not between hind legs. Hind tibiae distinctly swollen and enlarged. with 13 segments in males, 14 segments in females. Females possess long ovipositor, sometimes with white tip. Body length 13–40 mm, with much of length due to ovipositor in females.
Habitat
Associated with supporting solitary bees and that nest in twigs or borings in wood. frequent flowering plants, especially umbelliferous (Apiaceae) such as wild carrot.
Distribution
Recorded from Czech Republic, Slovakia, Hungary, and Canada (Alberta, British Columbia, Manitoba, New Brunswick).
Seasonality
activity peaks in late spring (latter half of May) and mid-summer (July).
Host Associations
- Hylaeus confusus - larva
- Hylaeus pectoralis - larva
- Pemphredon fabricii - larva
Life Cycle
Female deposits deep in nest tunnel using long ovipositor. Larva hatches and feeds on pollen, nectar, or prey provisions stored for host larva rather than consuming the host larva directly.
Behavior
exhibit vertical and horizontal leg-swaying during near nests, hypothesized to tune into vibrational signals from hosts. Enlarged hind tibiae with adjacent to subgenual organ amplify vibrational detection.
Ecological Role
of solitary bees and . Acts as regulator of soil-nesting and twig-nesting Hymenoptera.
Human Relevance
Non-stinging; may benefit from mimicry of stinging . observed at flowers used in ecological studies and monitoring.
Similar Taxa
- Ichneumon waspsSimilar slender body but distinguished by many more antennal segments and lack of swollen hind tibiae
- Ammophila (Sphecidae)Similar appearance but lacks pronounced neck and high abdominal attachment; different nesting
More Details
Leg morphology and function
Enlarged hind tibiae contain tissue adjacent to subgenual organ, involved in vibrational signal detection and possibly dynamics and detoxification.