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A Note on Host Detection by Buathra tarsoleuca (Schrank) (Hymenoptera: Ichneumonidae), a Parasite of Ammophila sabulosa (L.) and Podalonia affinis (Kirby) (Hymenoptera: Sphecidae)
Authors:Maurizio Casiraghi  Franco Andrietti  Francesco Bonasoro  Adriano Martinoli
Institution:(1) Istituto di Patologia Generale Veterinaria, Università degli Studi di Milano, Via Celoria 10, 20133 Milano, Italy;(2) Dipartimento di Biologia, Università degli Studi di Milano, Via Celoria 26, 20133 Milano, Italy
Abstract:Parasitism by Buathra tarsoleuca (Schrank) of Ammophila sabulosa (L.) and Podalonia affinis (Kirby) nests was studied by means of a frame-by-frame analysis of video recordings obtained in the field. We describe behavioral patterns (with some additional ecological notes) during host detection and provide a schematic diagram for the sequence of events involved in this process. Using scanning electron microscopy, we have found morphological details in the antennae, ovipositor sheaths, and ovipositor of B. tarsoleuca which we suggest are involved in parasitism. The possible parasitism of the same hosts by two other ichneumonid wasps, Cryptus sp. and Meringopus calescens (Grav.), is discussed.
Keywords:Buathra tarsoleuca  host detection  behavioral ecology  ovipositor morphology  parasitism
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