Pompilidae

Spider Wasps, Spider-hunting Wasps, Pompilid Wasps

Subfamily Guides

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Spider wasps in the are solitary, stinging that hunt spiders to provision nests for their larvae. The family contains approximately 5,000 described in six , distributed worldwide. Most species capture and paralyze spiders using venom, then deposit them in burrows or cavities where a single is laid on each victim. Females of the Auplopus construct distinctive free-standing mud , while most other genera excavate burrows in soil or use pre-existing cavities. Members of the subfamily Ceropalinae are kleptoparasites, laying eggs in the nests of other pompilids or acting as ectoparasitoids of living spiders rather than building their own nests.

Caliadurgus fasciatellus by (c) Owen Strickland, some rights reserved (CC BY), uploaded by Owen Strickland. Used under a CC-BY license.Calopompilus by (c) Thomas Koffel, some rights reserved (CC BY), uploaded by Thomas Koffel. Used under a CC-BY license.Calopompilus deceptus by (c) Victor Engel, some rights reserved (CC BY), uploaded by Victor Engel. Used under a CC-BY license.

Pronunciation

How to pronounce Pompilidae: /pɒmˈpɪlɪdiː/

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Identification

Identification to or typically requires microscopic examination of morphological features. Many species are blue-black in coloration with few distinguishing field marks. The genus Auplopus can be recognized by females having an oval pygidial plate on the near the tip, used to manipulate mud during nest construction. Anoplius species have smooth outer edges on the hind tibiae, distinguishing them from Pepsinae. Ageniella females exhibit -mimicry with banded wings and long legs, while males are black with reddish leg markings and a white abdominal tip. Caliadurgus hyalinatus females have clear wings with dark spots on the forewings, a bicolored abdomen, and toothed hind tibiae.

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Habitat

vary by and . Anoplius aethiops occurs in open areas including fields, forest edges, meadows, and prairies, replaced by A. cleora in sand dune habitats. Pepsis elegans inhabits mesic open woodland within the Eastern Temperate Forests ecoregion. Auplopus species construct nests in sheltered such as under bark on standing trees, rock wall crevices, or inside abandoned nests of other including Sceliphron caementarium, Trypoxylon politum, and Polistes species. Caliadurgus hyalinatus has been documented in sandy soils where burrow excavation is facilitated.

Distribution

worldwide distribution. In North America, occurs coast to coast in the United States, southern Canada, and Mexico. Anoplius aethiops ranges from southern British Columbia and southeast Canada through the United States (except North Dakota) to Mexico and Guatemala. Auplopus occurs across the entire North American continent; A. carbonarius is introduced from western Europe and documented in New York and Michigan. Caliadurgus hyalinatus ranges across eastern North America west to Washington state, the Dakotas, and Kansas, with sparse records in Texas, New Mexico, and Arizona; also occurs in Europe. Australia contains 256 in 45 and four . Iran records 162 species in 41 genera and three subfamilies, with highest diversity in northern provinces.

Seasonality

Activity periods vary by and latitude. Anoplius aethiops is most common in late summer and persists into late fall, with typical seasonal range from late July through mid-September. Auplopus species are active from May to October, with peak abundance from July through September. Anoplius species are active in spring on the Front Range of Colorado.

Diet

females hunt spiders exclusively to provision larval nests. Documented prey include Lycosidae (wolf spiders), Araneidae (orb weavers), Thomisidae (crab spiders), Salticidae (jumping spiders), Clubionidae (sac spiders), Corinnidae (ground sac spiders), Anyphaenidae (ghost spiders), Miturgidae (longlegged sac spiders), Gnaphosidae (ground spiders), Pisauridae (nursery web spiders), Agelenidae (grass spiders), and Mygalomorphae including Euctenizidae, Antrodiaetidae, and Halonoproctidae (trapdoor spiders). Caliadurgus hyalinatus specializes on Araneidae. Auplopus are opportunistic hunters of non-web-building spiders. Adults of some species, including Auplopus, feed on honeydew from colonies on plants such as honeyvine milkweed, sunflower, and other vegetation. Both sexes of Anoplius aethiops visit flowers including wild carrot, goldenrod, sweet clover, milkweed, and thoroughwort for nectar.

Host Associations

  • Araneae - preyPrimary larval food source; spiders paralyzed by venom and deposited in nests

Life Cycle

Females dig burrows or use pre-existing cavities, then hunt spiders and sting them into paralysis. The immobilized spider is transported to the nest—sometimes with legs amputated to facilitate handling—and deposited in a . A single is laid on the spider, which serves as the sole food source for the developing larva. The female then seals the cell and may repeat the process. In Auplopus, multiple spiders may be placed in each mud cell before egg-laying and sealing. At least one Auplopus has been observed emerging by regurgitating liquid to soften the mud cap before chewing through.

Behavior

Nesting varies substantially among . Most excavate burrows in soil, sometimes originating inside existing cavities or crevices. Auplopus females construct free-standing mud using a pygidial plate to manipulate mud pellets, often stacking barrel-shaped cells end-to-end in rows of two to five. Some females dig multiple burrows simultaneously before selecting one to complete. Prey transport methods include backwards while hoisting the spider with , or climbing vertical objects to glide with the prey. Females of some genera amputate spider legs to facilitate transport and to feed on . Ceropalinae species are kleptoparasites, invading nests of other pompilids rather than hunting directly. Some Ageniella species exhibit -mimicry as , presumably for protection from .

Ecological Role

Spider wasps function as significant of spiders, potentially influencing spider and structure. Their specialized relationship with spiders represents a distinct trophic interaction within . As nectar-feeders, some may contribute to pollination, though this has not been quantified. Kleptoparasitic species in Ceropalinae create additional complexity in pompilid community interactions.

Human Relevance

Not medically significant; stings are not considered dangerous to humans, though individual reactions vary. Occasionally enter human dwellings when nesting in structural cavities. The is well-studied taxonomically, with extensive collections including Marius Wasbauer's donation of over 50,000 specimens to the UC Davis Bohart Museum. Some are subjects of behavioral research, including classic studies by Jean Henri Fabre.

Similar Taxa

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Taxonomic Diversity

The comprises six : Ceropalinae, Pepsinae, Pompilinae, and others. Australia contains four subfamilies with 45 and 256 . Iran records three subfamilies with 41 genera and 162 species.

Sexual Dimorphism

Males and females often differ substantially in appearance. In Ageniella, females are orange and brown with banded wings (-mimics), while males are black with reddish leg markings and a white abdominal tip. In Auplopus, males can be identified by genitalia differences, while females are externally inseparable among several .

Research Importance

are among the better-studied solitary , with extensive literature on , nesting , and associations. However, information remains scattered across many journals, and most lack detailed biological accounts. Citizen science observations and voucher specimen collection remain valuable for advancing knowledge.

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