igacovirus igacovirus igacovirus is a subgenus of viruses in the genus gammacoronavirus. igacovirus virus classification (unranked): virus realm: riboviria kingdom: orthornavirae phylum: pisuviricota class: pisoniviricetes order: nidovirales family: coronaviridae genus: gammacoronavirus subgenus: igacovirus species see text species the genus consists of the following three species: avian coronavirus avian coronavirus 9203 duck coronavirus 2714