There are subtle but important differences in the phylogenetic position of the bat SaV in the three phylogenetic trees. In the tree based on the full-length amino acid sequences of the ORF1 polyprotein, the bat SaVs are clustered tightly with the porcine SaVs in a monophyletic clade constituting the SaVs. However, in the VP1 tree, the bat SaVs are positioned just outside the clade of other SaVs. In the VP2 tree, the bat SaVs are located approximately equidistant from the GII noroviruses and porcine SaVs. The phylogenetic positions of the bat SaVs are supported by high Shimodaira-Hasegawa-like approximate likelihood ratio test (SH-like aLRT) branch support values as calculated by PhyML.