Micromyzus nigrum is an aphid in the superfamily Aphidoidea in the order Hemiptera. It is a true bug and sucks sap from plants.
References
https://aphid.speciesfile.org/otus/910210/overview http://animaldiversity.org/accounts/Micromyzus_niger/classification/ http://www.pherobase.com/database/invasive-species/species-Micromyzus-niger.php https://www.gbif.org/species/11235226