Poecilopompilus algidus marcidus

(Smith, 1862)

Poecilopompilus algidus marcidus is a of spider wasp in the Pompilidae. This subspecies belongs to a known for Müllerian mimicry with paper wasps, displaying warning coloration that advertises its ability to deliver painful stings. Like other members of Poecilopompilus, females hunt orbweaver spiders (family Araneidae) to provision nests for their larvae. The P. algidus exhibits remarkable geographic variation in coloration across its range, with subspecies including marcidus representing regional morphological variants.

Pronunciation

How to pronounce Poecilopompilus algidus marcidus: //ˌpiːsiːloʊˈpɒmpɪləs ˈælɡɪdəs ˈmɑːrsɪdəs//

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Identification

Identification of P. algidus marcidus to level requires examination of specific morphological characters. For the P. algidus generally, females have three strong spines on the front and strongly convergent inner margins at the top, distinguishing them from the similar P. interruptus which has four weak spines and parallel inner eye margins. The subspecies marcidus likely represents one of the darker northern or western color variants, though specific diagnostic features for this subspecies are not detailed in available sources.

Distribution

The marcidus has been documented from specific regions within the broader range of P. algidus, which extends from California to Arizona, Utah, Texas, Florida, and north to South Dakota, Minnesota, Michigan, and Massachusetts. The type locality and precise range boundaries of marcidus are not specified in available sources.

Diet

Females hunt exclusively orbweaver spiders in the Araneidae. The stings the spider into weak paralysis and transports it to a nesting burrow where it serves as provisions for a single larva.

Host Associations

Life Cycle

Females excavate shallow burrows 2.5–11 cm deep in bare soil, often at the base of vegetation. Each burrow contains a spherical terminal chamber where a single paralyzed spider is placed and an is laid upon it. The burrow entrance is carefully concealed after provisioning. Larvae develop as solitary ectoparasitoids on the spider .

Behavior

visit flowers and extrafloral , particularly of sunflower (Helianthus spp.), to feed on nectar. Females hunt by capturing orbweaver spiders, stinging them into paralysis, and dragging them backward overland to nesting sites. They exhibit Müllerian mimicry with paper wasps (Polistes), sharing warning coloration.

Ecological Role

As a of orbweaver spiders, this helps regulate spider . Its mimicry relationships contribute to predator education regarding aposematic coloration in wasp .

Human Relevance

The sting is memorable and painful, though the are not aggressive unless handled. They may be encountered in gardens and natural areas where orbweaver spiders are abundant.

Similar Taxa

  • Poecilopompilus interruptusOverlapping distribution and similar appearance; distinguished by female having four weak spines on front and parallel inner margins (versus three strong spines and convergent eyes in P. algidus)
  • Polistes auriferShares yellow and brown warning coloration through Müllerian mimicry; distinguished by different (Vespidae), social , and nest construction
  • Anoplius spp.Northern of P. algidus may mimic all-black Anoplius spider wasps with red abdominal bands; distinguished by different tarsal spine count and margin structure

More Details

Subspecies variation

Poecilopompilus algidus includes at least four recognized , with marcidus representing one regional variant. The exhibits remarkable color plasticity, with southern resembling large paper wasps and northern populations mimicking black spider wasps with red markings.

Taxonomic note

This was described by Smith in 1862. The Poecilopompilus is primarily tropical with only three reaching the United States.

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Sources and further reading