Research data to: Harl, J; Himmel, T; Ilgūnas, M; Valkiūnas, G; Weissenböck, H (2023): The 18S rRNA genes of Haemoproteus (Haemosporida, Apicomplexa) parasites from European songbirds with remarks on improved parasite diagnostics. Malar J. 2023; 22(1):232. doi.org/10.1186/s12936-023-04661-9