Rhorus
Förster, 1869
Rhorus is a of in the Ichneumonidae. in this genus are koinobiont endoparasitoids of larvae. The genus has a wide distribution across the Palaearctic region and North America. At least one species, Rhorus exstirpatorius, has been the subject of genomic sequencing.
Pronunciation
How to pronounce Rhorus: //ˈroʊ.rəs//
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Habitat
Woodland ; Rhorus exstirpatorius has been collected in deciduous woodland settings such as Wytham Woods, Oxfordshire, UK.
Distribution
Europe, Northern America, and across the entire Palaearctic region. Distribution records confirmed from Denmark, Norway, and Sweden.
Seasonality
active from May through September; possibly plurivoltine with peak abundance observed in early September in some locations.
Host Associations
- sawfly larvae (Hymenoptera: Tenthredinoidea, Pamphilioidea) - koinobiont endoparasitoid
- Nematinae (Tenthredinidae) - of
- Nematus species - records considered most likely reliable
- Pristiphora species - records considered most likely reliable
Life Cycle
Koinobiont endoparasitoid development: the larva develops inside the living , which continues to feed and grow after oviposition. Oviposition occurs either into or through the of early instar host larvae. Possibly plurivoltine with multiple per year.
Behavior
Females use a slender, specialized ovipositor to access ; the ovipositor lacks a subapical notch, which is distinctive for this .
Ecological Role
of larvae, likely contributing to of sawfly in woodland .
More Details
Genomic resources
A assembly of 420.30 Mb has been generated for Rhorus exstirpatorius, scaffolded into 10 chromosomal pseudomolecules, with a mitochondrial genome of 21.77 kb.
Taxonomic reliability of host records
Many historical records for Rhorus are considered unreliable due to misidentifications of the themselves and unreliable identifications of host larvae. Host records for Nematus and Pristiphora species from Zinnert (1969) are noted as most likely reliable.