Phylogenetic tree for selected members of the Sarcocystidae based on 18S rRNA sequences and inferred by the maximum parsimony (MP) method using the Tree-Bisection-Regrafting (TBR) algorithm. The analysis involved 52 nucleotide sequences (GenBank accession numbers behind the taxon names), and a total of 2,014 positions in the final dataset. The values between the branches represent percent bootstrap value per 1,000 replicates, and the values below 50% are not shown. The three new sequences of Sarcocystis tenella (MF039329) and S. arieticanis (MF039330 and MF039331) have the taxon name in boldface.