Ormyrus nitidulus is a small metallic wasp approximately 5mm long as an adult.

[2] The Universal Chalcidoidea Database [2] cites distribution records for Ormyrus nitidulus from: Algeria, Andorra, Austria, Azerbaijan, Belgium, Bosnia Hercegovina, Bulgaria, Caucasus, Croatia, Czech Republic, Czechoslovakia, Denmark, Europe, France, Georgia, Germany, Greece, Hungary, Iran, Italy, Sardinia, Sicily, Jordan, Macedonia, Netherlands, North Africa, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey, Ukraine, United Kingdom, United States of America, USSR, Yugoslavia (pre 1991).

GBIF holds 128 georeferenced records for Ormyrus nitidulus [3] Ormyrus nitidulus larvae are idiobiont (prevent further development of the host after initial parasitization) ectoparasitoids (live on the outside of its host) primarily associated with oak gall wasps including multiple species of Andricus and one species of gall midges: Oligotrophus bergenstammi.

are generally characterised by bright metallic colours, coarsely crenulated sculpture of the metasoma, well-developed hind coxae, short stigmal veins and two stout and curved metatibial spurs.

There are 10 specimens of Ormyrus nitidulus available to view on the NHM Data Portal.