Some lacewings lay their eggs on slender stalks. These normally give rise to hairy little nymphs that are voracious predators of psyllids. But from each of these darkened eggs, a single tiny wasp emerged.

Trichogramma. Length: less than 0.5mm (females slightly larger).
[host – Neuroptera, species uncertain]

[full details in Paul’s 2018 blogs ‘Déjà vu! Another egg parasitoid wasp’]