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In page Cichlid:
"As an example of the classification problems, Kullander[5] placed the African genus Heterochromis phylogenetically within Neotropical cichlids, although later papers[citation needed] concluded otherwise. Other problems center upon the identity of the putative common ancestor for the Lake Victoria superflock (many closely related species sharing a single habitat), and the ancestral lineages of Lake Tanganyikan cichlids.[citation needed]
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