Listrodromus nycthemerus
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| Listrodromus nycthemerus | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Clade: | Pancrustacea |
| Class: | Insecta |
| Order: | Hymenoptera |
| Family: | Ichneumonidae |
| Genus: | Listrodromus |
| Species: | L. nycthemerus |
| Binomial name | |
| Listrodromus nycthemerus (Gravenhorst, 1820) | |
| Synonyms[1] | |
| |

Listrodromus nycthemerus, the holly blue Darwin wasp,[2] is a species of ichneumon wasp belonging to the family Ichneumonidae. This species is a parasitoid, its sole host species being the holly blue butterfly (Celastrina argiolus).
Listrodromus nycthemerus was first formally described as Ichneumon nycthemerus by the German zoologist Johann Ludwig Christian Gravenhorst from Piedmont.[1] This species was classified in the new genus Listrodromus in 1845 by Constantin Wesmael, this species being the type species of that genus.[3] Traditionally the genus was included in the tribe Listrodromini within the subfamily Ichneumoninae but is now classified within tribe Ichneumonini.[4]