Martin Bláha visited the University of Zagreb, the Faculty of Science, the Department of Biology. During his stay lasting from 22nd to 29th September, applicant improved and trained skills using new package of BEAST 2 software under the supervision of prof. Ivana Maguire. Applicant used real data from European crayfish species to asses age of various nodes in phylogenetic trees and thus be able to suggest historical biogeography of particular species of interest. Further, applicant discuss the structure and way of molecular data processing for a joint scientific publication. I’d like to acknowledge ERASMUS+ program which financially supported this stay.