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In computer science, and in particular functional programming, a hylomorphism is a recursive function, corresponding to the composition of an anamorphism followed by a catamorphism. Fusion of these two recursive computations into a single recursive pattern then avoids building the intermediate data structure. This is an example of deforestation, a program optimization strategy. A related type of function is a metamorphism, which is a catamorphism followed by an anamorphism.
Synapomorphy is a shared derived character or trait state that distinguishes a clade from other organisms.[1] In other words, it is an apomorphy shared by members of a monophyletic group, and thus assumed to be present in their most recent common ancestor. The word synapomorphy, coined by German entomologist Willi Hennig, is derived from the Greek words ÏÏÎ½, syn = shared; á¼ÏÏ, apo = away from; and Î¼Î¿ÏÏÎ®, morphe = shape.