Phylogeny of tick-borne hemogregarines (Eucoccidiorida order) constructed using maximum-likelihood (ML) estimations based on 18S rDNA sequences (461 unambiguously aligned bp; best-fit approximation for the evolutionary model on the basis of Akaike information criterion: HKY+G). Only one 18S rDNA sequence per genovariant and per host species is shown for data produced in this study (in bold). GenBank accession numbers of sequences used in analyses are shown on the phylogenetic trees. Numbers at nodes indicate bootstrap support percentage with 1000 replicates. Only bootstrap values >70% are shown. The scale bar is in units of mean number of substitutions/site. The right part of the figure presents the prevalence of Apicomplexa infection observed for each infected species (on a logarithmic scale).