herdecovirus herdecovirus herdecovirus is a subgenus of viruses in the genus deltacoronavirus, consisting of a single species, night heron coronavirus hku19. night heron coronavirus hku19 virus classification (unranked): virus realm: riboviria kingdom: orthornavirae phylum: pisuviricota class: pisoniviricetes order: nidovirales family: coronaviridae genus: deltacoronavirus subgenus: herdecovirus species: night heron coronavirus hku19