Ancistrocerus unifasciatus seminole

Bequard, 1943

Ancistrocerus unifasciatus seminole is a of mason wasp in the Vespidae. As a member of the Eumeninae, it is a solitary that constructs nests using mud in pre-existing cavities or abandoned mud dauber nests. The hunts caterpillars to provision its nests, with females capturing and paralyzing prey using venom. This subspecies was described by Bequard in 1943.

Pronunciation

How to pronounce Ancistrocerus unifasciatus seminole: //ænˈsɪstroʊˌsɪərəs juːnəˌfæsɪˈeɪtəs ˈsɛmɪˌnoʊl//

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Identification

Distinguished from other Ancistrocerus by the transverse carina (ridge) on the base of the first abdominal segment (T1), creating an abrupt angle facing the rear of the . Males have hooked tips, a characteristic feature of male eumenine . Coloration is deep brown or black with limited yellow markings on the , antennae, base, and legs. Males display a large yellow patch on the face, while females have smaller spots.

Distribution

Vermont, United States. The parent Ancistrocerus unifasciatus ranges throughout the eastern United States west to Iowa, Kansas, and Texas, and occurs in southern Ontario, Quebec, and Prince Edward Island, Canada.

Diet

feed on flower nectar, honeydew, fermenting tree sap, and other -rich liquids. Females hunt caterpillars, particularly leafroller caterpillars in the Tortricidae, to provision nests for their larvae.

Life Cycle

Females construct nests in pre-existing cavities such as abandoned mud dauber nests (particularly those of Sceliphron caementarium and Trypoxylon politum), hollow twigs, or borings in wood. The nest is divided into using mud partitions. The female lays an in an empty cell before provisioning it, then caches several paralyzed caterpillars. The larva hatches, feeds on the stored prey, spins a silken cocoon, and pupates. emerge by chewing through the mud wall.

Behavior

Females exhibit specialized hunting to extract caterpillars from leaf rolls. Rather than tearing open the silk-bound shelter, the runs to one end of the leaf roll and vibrates her to entice the caterpillar to eject itself. This exploits the caterpillar's escape response of dropping from its shelter on a silken line. Once captured, the caterpillar is stung multiple times to induce paralysis.

Ecological Role

of caterpillars, contributing to natural control of . Serves as a model for mimicry by syrphid flies such as Temnostoma .

Similar Taxa

Ancistrocerus campestrisSimilar size and characteristics, but A. campestris has yellow hind margins on the first three abdominal segments and hunts leaf-tier caterpillars in oak leaves rather than leafrollers.
Ancistrocerus waldeniiBoth are Ancistrocerus mason wasps, but A. waldenii constructs free-form mud nests attached to hard surfaces rather than using pre-existing cavities, and has white markings with a spot on T6.
Temnostoma syrphid fliesThese flies are visual mimics of Ancistrocerus and other mason wasps, but can be distinguished by their single pair of wings ( have two pairs), short , and habit of waving front legs to simulate wasp antennae.