Aphilanthops frigidus
(F. Smith, 1856)
Eastern Ant-Queen Kidnapper
Aphilanthops frigidus is a solitary in the Crabronidae, commonly known as the Eastern - Kidnapper. The is to North America and specializes in hunting winged queens of ants in the Formica. Females excavate individual nest burrows in sandy soil, provisioning with paralyzed ant queens for their . The species is active primarily during the summer months when ant colonies undergo their .
Pronunciation
How to pronounce Aphilanthops frigidus: /ˌæfɪˈlænθɒps ˈfrɪdʒɪdəs/
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Identification
Distinguished from similar beewolf ( Philanthus) by straight inner margins rather than notched (emarginated) margins. are nectar-feeding and may be observed at flowers. The genus Aphilanthops is restricted to North America, and A. frigidus is the most widespread and commonly encountered in the eastern and northern parts of the continent.
Habitat
Nests are excavated in flat or gently sloping sandy soil. Multiple females typically nest in close proximity, forming loose . frequently visit flowers for nectar, particularly in open or semi-open .
Distribution
Transcontinental across North America, ranging from Nova Scotia to British Columbia. Southern limits follow major mountain ranges: south to the Carolinas along the Appalachians, New Mexico and Arizona in the Rocky Mountains and Southwest, and central California (primarily coastal).
Seasonality
Active mostly from late June to mid-August in New York and similar latitudes; peak activity coincides with , which typically occur on a single day per year for any given ant colony.
Diet
feed on nectar from flowers. are provisioned exclusively with paralyzed winged of in the Formica.
Host Associations
- Formica - winged paralyzed and stored as larval provisions
Life Cycle
Females excavate burrows descending at approximately 45 degrees to a 'waiting room' 12-25 cm below the surface, where up to four are temporarily stored. are constructed at 23-45 cm depth, each receiving 2-3 ant queens and a single laid on one victim. The number of brood cells per nest is unknown. After provisioning, the burrow entrance is filled with soil. Developmental period from egg to has not been documented.
Behavior
Females hunt during the brief window of ant colony , attacking queens either immediately upon from nests or upon landing after . of are removed before . Prey is flown to the nest threshold, inspected, then dragged underground by an . Males defend nectar sources as territories to intercept females.
Ecological Role
of reproductive , potentially influencing local ant . Serves as during nectar-feeding. Subject to by satellite ( ), which may regulate .
Human Relevance
Not economically significant. Occasionally observed by naturalists and ; observations of hunting are considered noteworthy due to rarity of witnessing the behavior.
Similar Taxa
- Philanthus spp.Similar size, coloration, and general appearance as beewolf ; distinguished by straight (not notched) inner margins in Aphilanthops
- Aphilanthops hispidusCongeneric in western North America; A. frigidus is more widespread in eastern and northern regions
More Details
Parasitism
Confirmed : Senotainia trilineata (), which larviposits on during transport. Suspected parasites include Metopia leucocephala and Euaraba tergata, observed near nest .
Nesting biology uncertainties
The typical number of per nest and total reproductive output per female remain unknown. No published observations exist for other than A. frigidus within the .