In 1966Brundin studied the Antartic chironomid midges which are distributed around thesouthern hemisphere and he constructed a phylogeny by standard morphological technique using the species modern biogeographic distributions to draw a combined picture of phylogeny and biogeography in the form of cladogram.
This approach can be tested against the geological evidence which turn out to fit Brundin’s predictions. The environment occupied by species move in a meticulous through time then all groups of living things found in an area will be affected as well in the same manner.
Congruence are condition that can be applied to any sort of branching diagrams when the two diagrams are congruent the order of branching in the two do not contradict one another. These two diagrams need not to beidentical since in one place or onetaxon might be missing due to some environmental factors.