Pristaulacus occidentalis

(Cresson, 1879)

Pristaulacus occidentalis is a of aulacid described by Cresson in 1879. The species belongs to Aulacidae, a group of wasps in the superfamily Evanioidea. It is to North America, with distribution records from Canada including Alberta. The Pristaulacus is one of two genera in Aulacidae, comprising approximately 185 species globally with 32 species recorded in North America.

Pronunciation

How to pronounce Pristaulacus occidentalis: //pɹɪsˈtɔːləkəs ˌɑksɪˈdɛnˌtælɪs//

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Identification

Aulacid wasps including Pristaulacus occidentalis can be distinguished from superficially similar ichneumon wasps by three key characters: the attaches high on the (), there is a short 'neck' behind the , and the ovipositor is somewhat sinuous rather than straight. These features reflect the 's relationship to ensign wasps and carrot wasps within Evanioidea. -level identification of P. occidentalis requires examination of specific morphological characters not detailed in available sources.

Distribution

North America. Distribution records include Canada (Alberta). The is to the Nearctic region.

Host Associations

wood-boring beetles - Aulacidae are known of wood-boring beetles, particularly Cerambycidae (longhorned beetles) and Buprestidae (jewel beetles), as well as larval wood wasps in Xiphydriidae. This association is documented for the family and but not specifically confirmed for P. occidentalis.

Behavior

Females of Pristaulacus have been observed haltingly across logs, bobbing their slightly, and slowly rowing their wings. They probe cracks and crevices by inserting their deeply, apparently locating through this . The ovipositor is guided by grooves on the inner surface of the hind during insertion into wood.

Ecological Role

As a , Pristaulacus occidentalis contributes to of wood-boring beetles. Aulacids are part of the natural enemy complex associated with freshly cut or stressed wood .

Similar Taxa

Pristaulacus fasciatusCongeneric with similar and . P. fasciatus occurs from eastern Texas and Nebraska eastward, while P. occidentalis has a more western distribution.
ichneumon wasps (Ichneumonidae)Superficially similar in appearance and use. Distinguished by aulacid characters: high abdominal attachment on , short 'neck' behind , and sinuous ovipositor.
Aulacus speciesThe other in Aulacidae. Aulacus are typically smaller than Pristaulacus species.

More Details

Subspecies

Two are recognized: Pristaulacus occidentalis occidentalis (Cresson, 1879) and Pristaulacus occidentalis lavatus (Townes, 1950).

Taxonomic history

Originally described by Cresson in 1879. The lavatus was described by Townes in 1950.