Pompilinae

spider wasps

Tribe Guides

5

Pompilinae is a of spider wasps ( Pompilidae) comprising approximately 107 . are solitary that hunt spiders, paralyzing them with venom to serve as food for their larvae. Females excavate burrows or use pre-existing cavities, deposit a single on the paralyzed prey, and conceal the nest entrance. The subfamily exhibits considerable diversity in associations and nesting across its constituent tribes.

Poecilopompilus algidus willistoni by (c) Colin Croft, some rights reserved (CC BY), uploaded by Colin Croft. Used under a CC-BY license.Pompilini by (c) Francisco Farriols Sarabia, some rights reserved (CC BY), uploaded by Francisco Farriols Sarabia. Used under a CC-BY license.Poecilopompilus algidus willistoni by (c) Colin Croft, some rights reserved (CC BY), uploaded by Colin Croft. Used under a CC-BY license.

Pronunciation

How to pronounce Pompilinae: /pɒmˈpɪlɪniː/

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Identification

Pompilinae can be distinguished from other Pompilidae by several morphological features: with oval to only slightly sinuate inner margins; short ; middle and hind legs with tibial spurs of unequal lengths and bearing small spines or pits; hind leg with wide, blade-like bristles on the fifth tarsomere; forewing with medial (M) falling short of the margin and second cubital vein (Cu2) bent at the base rather than straight.

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Habitat

Members of this occupy diverse including open fields, forest edges, meadows, prairies, woodlands with sandy soil, and urban environments. Specific habitat preferences vary by and .

Distribution

Pompilinae has a worldwide distribution. The is represented across North America from coast to coast, throughout Central and South America, Europe, Asia, Africa, and Australia. Individual and have more restricted ranges.

Seasonality

activity varies by and latitude. Many species are active from spring through fall, with peak abundance in summer months. Some species with two annually occur in southern latitudes, while northern typically have one generation per year.

Diet

feed primarily on nectar from flowers including wild carrot, goldenrod, sweet clover, milkweed, and other blossoms. Some visit extrafloral or feed on honeydew. Larvae are obligate , feeding exclusively on paralyzed spiders provided by the female parent.

Host Associations

Life Cycle

Females paralyze spiders with venom, transport them to nest burrows, and deposit a single on each victim. Larvae develop through feeding on the living but immobilized . occurs within the sealed nest chamber. Most have one annually; some southern have two generations.

Behavior

Females exhibit remarkable strength, dragging spiders that may exceed their own body weight backwards to nesting sites. Burrow excavation involves biting through soil and kicking debris with the front legs. Nest concealment is thorough, with females scraping soil over entrances and compacting it with abdominal blows. Some dig multiple burrows simultaneously before selecting one to complete. Males are often observed on flowers and may patrol nesting areas.

Ecological Role

Pompilinae function as significant of spiders, potentially influencing spider and structure. Their specialized lifestyle represents an important trophic interaction in terrestrial . contribute to pollination through nectar feeding.

Human Relevance

Spider wasps are generally not aggressive toward humans but can deliver painful stings if handled or threatened. They are beneficial as agents of spiders, including venomous such as widow spiders in some regions. Some species exhibit striking Müllerian mimicry of paper wasps or other hymenopterans.

Similar Taxa

  • CtenocerinaeFormerly treated as tribe Ctenocerini within Pompilinae; elevated to status based on distinct morphological features
  • NotocyphinaeFormerly treated as tribe Notocyphini within Pompilinae; removed as separate in 2015 based on phylogenetic evidence
  • PepsinaeAnother of Pompilidae; distinguished by serrate or pectinate hind tibial spurs versus smooth outer edges in Pompilinae
  • CeropalinaeCuckoo spider wasps; distinguished by kleptoparasitic (invading nests of other ) rather than hunting their own prey

More Details

Taxonomic complexity

Tribal classification within Pompilinae has undergone extensive revision with little consensus between authors. Bradley's 1944 classification recognized 7 tribes; Evans's 1951 classification reduced this to 5. Engel and Grimaldi (2006) recognized 17 extant tribes, while Waichert et al. (2015) added two additional tribes and removed Notocyphini as a separate . Loktionov's 2023 distributional catalog further modified tribal assignments.

Mimicry

Some Pompilinae exhibit Müllerian mimicry. Poecilopompilus algidus in southern resembles large paper wasps (Polistes), while northern populations mimic other spider wasps such as Anoplius with black bodies and red abdominal bands.

Host specificity

associations range from highly specialized (e.g., Poecilopompilus on Araneidae orbweavers) to relatively (e.g., some Anoplius on multiple spider ). The Australian species Agenioideus nigricornis is notable for preying on the dangerously venomous Redback Spider (Latrodectus hasselti).

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