Coronavirus family tree....

The phylogenetic tree below shows the relationships among the four genera of coronaviruses (CoVs); Genus Alphacoronavirus, Betacoronavirus, Deltacoronavirus, Gammacoronavirus. 

This tree is based on full length genomes (nucleotides; aligned using Geneious Pro; Neighbor-Joining tree built using Mega with 500 bootstraps). 

The MERS-CoV clade of betacoronaviruses is marked on the left and the endemic human CoVs are indicated with yellow triangles.