thurisazvirus thurisazvirus thurisazvirus is a genus of viruses in the realm ribozyviria, containing the single species thurisazvirus myis. tome's spiny rat (proechimys semispinosus) serves as its host. thurisazvirus virus classification (unranked): virus realm: ribozyviria family: kolmioviridae genus: thurisazvirus synonyms tome's spiny-rat virus 1 (tsrv-1) rdev