Morphological features and origin of the newly obtained samples within this study.

<p>CZ – Czech Republic, SK – Slovakia, UK – England; OW – oocyst wall, MP – micropyle, OR – oocyst residuum.</p

Taxa and sequences included in the phylogenetic analyses.

*<p>: sequences included in the <i>Skeleton</i> matrix.</p><p>•: taxa used as outgroups for the phylogenetic analyses.</p><p>– : the sequence is not available.</p><p>Taxa for which new sequences were obtained in this study and Accession numbers of these sequences are printed in bold.</p

A <i>Skeleton</i> tree.

<p><i>Skeleton</i> tree (ML and BI) of the taxa for which all 3 genes (<i>18S rDNA</i>, <i>ORF 470</i> and <i>COI</i>) are available.</p

<i>Concatenated</i> ML tree.

<p> Letters A–D indicate clusters delimited according to the <i>Skeleton</i> tree (taxa present in the <i>Skeleton</i> tree are labeled with asterisks). Clades A and B are supported by both BI and ML analyses of the <i>Concatenated</i> and <i>Skeleton</i> matrices. The red node indicates a cluster with weak host specificity. Numbers 1–4 indicate lineages that are also supported by BI analyses of the following matrices: 1, <i>Concatenated</i>; 2, <i>ORF 470</i>; 3, <i>COI</i>; 4, <i>18S rDNA</i>. The newly added samples are printed in bold; coccidia from rodents are printed in blue. To decrease the size of the tree for the printed presentation, we removed several of the most basal outgroups.</p