Aphilanthops

Patton, 1881

ant-queen kidnapper

Species Guides

3

Aphilanthops is a of solitary digger wasps to North America, commonly known as "ant-queen kidnappers." The four described are specialized of winged queens, particularly in the genus Formica. females hunt during ant , paralyze ant queens, and transport them to underground nest burrows where they serve as provisions for developing larvae. The genus is distinguished from similar beewolf (Philanthus) by straight rather than notched inner margins.

Pronunciation

How to pronounce Aphilanthops: /ˌæfɪˈlænθɒps/

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Identification

Distinguished from beewolf (Philanthus) by straight inner margins versus the notched (emarginated) margins of Philanthus. The "- kidnapper" reflects the distinctive prey-carrying of females transporting paralyzed ant queens. Specific identification requires examination of morphological details; A. frigidus and A. hispidus are the most frequently encountered species.

Appearance

Medium-sized solitary with robust, somewhat hairy bodies. Distinguished from the closely related Philanthus by straight inner margins (emarginated in beewolves). Coloration and specific body proportions vary among the four described : A. frigidus, A. hispidus, A. foxi, and A. subfrigidus.

Habitat

Sandy or loose soil environments suitable for excavation of nest burrows. Nests are typically constructed in flat or gently sloping sandy soil. frequently visit flowers for nectar, including Baccharis salicifolia (seepwillow) and other blooming vegetation.

Distribution

to North America, including the United States, Canada, and Mexico. A. frigidus ranges from Nova Scotia to British Columbia, south along major mountain ranges to the Carolinas, New Mexico, Arizona, and central California (primarily coastal). A. hispidus occurs in the southwestern United States including Arizona.

Seasonality

activity coincides with periods. A. frigidus is active mostly from late June to mid-August in New York state; A. hispidus is abundant in August and September in Arizona. The narrow window of activity reflects the brief period when winged ant queens are available.

Diet

feed on nectar from flowers. Larvae are provisioned exclusively with paralyzed winged queens, primarily in the Formica. Each contains two to three ant victims; a single is laid on one of the victims.

Host Associations

  • Formica - preyWinged queens are the exclusive prey used to provision larval
  • Senotainia trilineata - Sarcophagid fly that larviposits on victims during transport to nest
  • Metopia leucocephala - suspected_parasiteObserved loitering near nest
  • Euaraba tergata - suspected_parasiteObserved loitering near nest

Life Cycle

Females excavate individual nest burrows descending at approximately 45 degrees, terminating in a "waiting room" 12-25 cm below the surface. Up to four queens are temporarily stored while additional are constructed at 23-45 cm depth. Each brood cell receives two to three ant queens with a single laid on one victim. The cell is then plugged. After provisioning all cells, the female fills in the burrow entrance.

Behavior

Females hunt winged queens during , attacking either immediately upon from nests or upon landing after . Prey wings are detached before transport. Ants are flown to the nest threshold, laid down while the female inspects the burrow, then dragged underground by an . Multiple females often nest in close proximity. Males establish and defend territories around nectar sources where females forage.

Ecological Role

of winged queens, potentially influencing ant colony and . contribute to pollination through nectar feeding. The serves as for parasitic sarcophagid flies.

Human Relevance

Not considered economically significant. Of interest to entomologists and natural historians due to specialized predatory . Described in popular natural history literature, notably Howard G. Smith's "Hunting Big Game in the City Parks" (1969), which introduced the "- kidnapper."

Similar Taxa

More Details

Nesting aggregation

Females typically nest in close proximity to one another, though whether this reflects active competition for prey from the same nests remains unknown.

Research opportunities

Detailed natural history observations exist primarily for A. frigidus; the other three (A. hispidus, A. foxi, A. subfrigidus) are poorly studied and represent opportunities for original research.

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