Bayesian (BEAST) maximum clade credibility COI tree of the Baetis fuscatus group in the Western Palaearctic. Coloured vertical boxes indicate species-delimitation hypothesis (i.e., MOTUs) according to the mPTP and ASAP methods. For each ASAP-based MOTU, the corresponding species names (where available) and the country/region of origin are provided, with the newly described species specified in bold and the associated GBIF codes highlighted in pale pink. Tips labelled with GBIF codes indicate newly sequenced specimens; PT002, ES029, and ES030 codes designate sequences from the project FREDIE; the GMGMQ2692-18 code is from BOLD; the other codes correspond to sequences obtained from GenBank. The three lineages, Baetis rifensis sensu lato (s.l.), Baetis scambus s.l., and Baetis fuscatus s.l., are labelled above or below their respective branches. Circles on branches indicate Bayesian posterior probabilities >0.9.