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The branching pattern of phylogenies provides information about the relationships between organisms.
Lack of knowledge:
There are many solutions to this polytomy; six possible solutions are shows below.
The cladogram below shows the phylogenetic relationship among the members of a group of fish called cichlids. Cichlid fish speciated quickly after their home lakes formed in Africa, resulting in several phylogenetic polytomies.
Cichlid clade after Takahashi, K, Y. Terai, M. Nishida, and N. Okada. 2001. Phylogenetic relationships and ancient incomplete lineage sorting among cichlid fishes in Lake Tanganyika as revealed by analysis of the insertion of retroposons. Marine Biology and Evolution 18(11):2057-2001.
Trees, Not Ladders
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Spanish translation of Understanding Evolution For Teachers from the Spanish Society of Evolutionary Biology.