Aphilanthops subfrigidus
Dunning, 1898
Western Queen Ant Kidnapper
Aphilanthops subfrigidus, known as the Western Kidnapper, is a solitary in the Crabronidae. Like other members of its , this is a of winged ant queens, particularly those in the genus Formica. The wasp hunts during the brief swarming period of ant colonies, paralyzing queens and transporting them to underground nest burrows as provisions for its larvae. It is native to western North America and is most commonly encountered when visit flowers for nectar.
Pronunciation
How to pronounce Aphilanthops subfrigidus: /æfəˈlænθɑps səbˈfrɪdʒɪdəs/
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Identification
Distinguished from the closely related Philanthus (beewolves) by straight inner margins; Philanthus have emarginated (notched) inner eye margins. Within Aphilanthops, A. subfrigidus can be separated from A. frigidus by geographic range—A. subfrigidus occurs in western North America while A. frigidus is found across much of the continent including eastern regions. Specific morphological differences between A. subfrigidus and other require closer examination.
Habitat
frequent flowering plants for nectar. Nesting occurs in flat or gently sloping sandy soils where females excavate individual burrows. Multiple females may nest in close proximity, forming loose .
Distribution
Western North America. Confirmed records from British Columbia, Canada. The occurs in western portions of the continent, distinct from the more widespread A. frigidus.
Diet
Host Associations
Life Cycle
Females excavate burrows 12-25 cm deep with a terminal 'waiting room' and additional 23-45 cm underground. Two to three queens are stored per brood cell; a single is laid on one victim. Based on congeneric A. frigidus, females likely provision 2-4 brood cells per nest. Cells are plugged after provisioning, and the burrow entrance is filled with soil upon completion. Developmental timing is synchronized with the brief swarming period of ant colonies.
Behavior
Females hunt winged queens during their , attacking either upon from nests or after landing. Victims are flown back to the nest, their wings detached before storage. The inspects the burrow before dragging the ant inside by an . Males establish and defend territories around flowering plants where females seek nectar.
Ecological Role
that regulates colony by preying on dispersing queens. Serves as for satellite flies (Sarcophagidae), including Senotainia trilineata, which larviposits on ant victims during transport.
Human Relevance
Non-aggressive toward humans. Occasionally observed by naturalists at flowers. Provides opportunities for citizen science documentation due to predictable nesting and specialized .
Similar Taxa
- Philanthus spp.Similar size and general appearance; distinguished by emarginated (notched) inner margins versus straight margins in Aphilanthops
- Aphilanthops frigidusOverlapping western range; A. subfrigidus is restricted to western North America while A. frigidus occurs across the continent including eastern regions
- Aphilanthops hispidus with similar ; A. hispidus is abundant in the southwestern United States, particularly on Baccharis salicifolia blossoms in late summer
More Details
Conservation of observations
Detailed natural history of this remains poorly documented. Most behavioral information is inferred from the better-studied A. frigidus. Direct observations of A. subfrigidus would contribute significantly to scientific knowledge.
Parasite pressure
Satellite flies in the Sarcophagidae, particularly Senotainia trilineata, are known that larviposit on victims during transport to the nest, potentially causing significant failure.