Fig. 1
From: Phylogeography of higher Diptera in glacial and postglacial grasslands in western North America
a Maximum clade credibility tree and b haplotype network of Meromyza columbi based on combined results from COI and Cyt b. a Posterior values of nodes below branch; 95% highest posterior density (HPD) interval of age (in Myr) of node above; branch lengths are scaled to time in Myr. b Each circle represents a single haplotype; small squares represent theoretical intermediates. Line lengths are arbitrary. Partitioned haplotypes represent haplotypes that are shared between regions. For the smallest circles, n = 1, otherwise size of circle is proportional to the abundance of the haplotype