Note on the introduced Asian mud-dauber wasp Sceliphron curvatum (F. Smith, 1870) and its prey in Belgium

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Note on the introduced Asian mud-dauber wasp Sceliphron curvatum (F. Smith, 1870) and its prey in Belgium

Abstract
This note documents the first observations of the prey of Sceliphron curvatum (F. Smith, 1870) (Hymenoptera: Sphecidae) in Belgium, recorded in the municipality of Jette (Brussels-Capital Region). The analysis of the paralyzed prey (n = 39) revealed the presence of nine spider species belonging to five families: Anyphaenidae, Araneidae, Philodromidae, Salticidae and Thomisidae. The family Araneidae dominates the trophic spectrum, represented mainly by juveniles of Araneus diadematus (Clerck, 1757). Two relatively rare species or species with a restricted regional distribution were identified: Macaroeris nidicolens (Walckenaer, 1802) (Salticidae) and Philodromus buxi (Simon, 1884) (Philodromidae). These data indicate opportunistic exploitation of spiders associated with upper (vegetation) layers and adaptation to anthropized habitats. The lack of marked trophic specialization in S. curvatum suggests a low risk of significant impact on native spider populations in Belgium. However, further quantitative studies are needed to assess potential competitive interactions with native arthropod predators. 

Henrard, Arnaud & Drumont, Hugo & Drumont, Alain. (2025). Note on the introduced Asian mud-dauber wasp Sceliphron curvatum (F. Smith, 1870) and its prey in Belgium. 40. Journal of the Belgian Arachnological Society Volume 40 (1) 2025