Null distribution over random trees for sister groupings of different ecomorphs on same host group. Cases in which lice of different microhabitat specializations, but from the same host group were terminal sister taxa were counted for each randomized tree. Actual number using the morphological (*) and molecular (**) trees indicated in relation to this null distribution.
Johnson et al. BMC Biology 2012 10:52 doi:10.1186/1741-7007-10-52