nl63-related bat coronavirus strain btkynl63-9b nl63-related bat coronavirus strain btkynl63-9b nl63-related bat coronavirus strain btkynl63-9b is a species of coronavirus in the genus alphacoronavirus. nl63-related bat coronavirus strain btkynl63-9b virus classification (unranked): virus realm: riboviria kingdom: orthornavirae phylum: pisuviricota class: pisoniviricetes order: nidovirales family: coronaviridae genus: alphacoronavirus subgenus: setracovirus species: nl63-related bat coronavirus strain btkynl63-9b