Ancistrocerus capra

Species Guides

Ancistrocerus capra spenceri

Ancistrocerus capra is a solitary mason wasp in the Eumeninae. Like other Ancistrocerus , females construct nests using mud, either in pre-existing cavities or as free-form structures attached to hard surfaces. They provision nests with paralyzed caterpillars as food for their developing larvae. The species exhibits the characteristic hooked in males typical of many eumenine .

Pronunciation

How to pronounce Ancistrocerus capra: //ænˈsɪstroʊˌsɪərəs ˈkæprə//

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Identification

Members of the Ancistrocerus can be identified by a prominent transverse carina (ridge) on the base of the first abdominal segment (T1), creating an abrupt angle that the rear of the rather than a gentle slope. Male Ancistrocerus have distinctly hooked tips, a trait shared with many male eumenine . Specific identification of A. capra requires examination of color pattern details, which are not well-documented in the provided sources.

Habitat

Forest edges and woodland . Nests are constructed on hard surfaces such as rocks, concrete, or terra cotta flower pots when building free-form mud structures, or in pre-existing cavities including hollow stems, borings in wood, and abandoned mud dauber nests.

Diet

feed on flower nectar, honeydew, and other -rich liquids. Females hunt caterpillars to provision nests; specific prey preferences for A. capra are not documented, though related Ancistrocerus use caterpillars from Tortricidae, Amphisbatidae, and Gelechiidae.

Life Cycle

Females construct mud , lay a single suspended from the cell roof by a silken thread, then provision the cell with multiple paralyzed caterpillars before sealing it with mud. Multiple cells may be constructed adjoining one another. The egg hatches in a few days; the larva feeds on the cached prey, then spins a silken cocoon and pupates. emerge weeks later by chewing through the mud partition.

Behavior

Females spend significant time and energy collecting water and soil to form mud for nest construction, with individual showing preferences for particular soil types such as sand or sandy loam. They scrape soil particles with their while regurgitating water to create mud boluses, which they carry back to the nest. Incomplete may be used for overnight shelter or protection from inclement weather.

Ecological Role

of caterpillars, contributing to natural control of larvae. Nests may be parasitized by bee flies (Toxophora amphitea), eulophid (Melittobia chalybii), and wedge-shaped beetles (Macrosiagon cruentum).

Similar Taxa

Ancistrocerus unifasciatusSimilar size range and coloration (black with yellow markings), but A. unifasciatus has distinct yellow banding pattern on and is known to reuse abandoned mud dauber nests more frequently.
Ancistrocerus campestrisSimilar transverse carina on T1 and general body form, but A. campestris has yellow markings on hind margins of first three abdominal segments and is documented to use leaf-tier caterpillars (Psilocorsis) as prey.
Ancistrocerus waldeniiSimilar free-form mud nest construction on hard surfaces, but A. waldenii has white (less often yellow) markings with specific pattern: spot on T6 and complete bands on T1-T5, plus entirely black in females.