English: The taxonomy tree of the order Nidovirales. BToV, bovine torovirus; DKNV, dak nong virus; EAV, equine arteritis virus; FCoV, feline coronavirus; HToV, human torovirus; IBV, infectious bronchitis virus; MERS-CoV, Middle East respiratory syndrome coronavirus; MHV, mouse hepatitis virus; PRRSV, porcine reproductive and respiratory syndrome virus; PEDV, porcine epidemic diarrhea virus; PToV, procine torovirus; TGEV, transmissible gastroenteritis coronavirus; SARS-CoV, severe acute respiratory syndrome coronavirus; YHV, yellow head virus; WBV, white bream virus.