Papilio-machaon
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Trogus lapidator
Trogus lapidator is an ichneumonid parasitoid wasp that develops within the pupae of the Old World swallowtail butterfly Papilio machaon. It is notable for an unusual emergence mechanism: rather than cutting through the host pupal case with mandibles like most related wasps, it primarily uses a liquid secretion to soften and dissolve host tissue, employing mandibles only secondarily to spread the secretion and minimally enlarge the exit hole at the end of emergence. The species occurs across Europe, with records from Finland to Belgium and Canada.