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- W2111380507 abstract "Fossils are the physical records of the history of morphological character evolution on Earth and can provide valuable information concerning the sequence and timing of origination of derived characters. Knowledge of the timing of origination of synapomorphies makes it possible to estimate when unobserved character changes occurred in the geological past. Here we present a method for estimating the temporal interval during which synapomorphies evolved. The method requires either direct inclusion of fossil taxa (with or without extant taxa) in cladistic analyses based on morphological or combined data, or indirectly using the “molecular scaffold approach.” Second, characters of interest are mapped on a most parsimonious tree and “minimum age node mapping” is used to place minimum ages on the nodes of the tree. Finally, characters of interest are evaluated for younger and/or older temporal constraints on the time of their origination; application of the older bound assumes ancestry of fossil terminals included in the tree. A key is provided herein describing the method. Among other applications, this approach has the potential to provide a powerful test of purported evolutionary cause–effect relationships. For example, the method has the ability to discover that derived characters of suggested adaptational significance may considerably pre-date the cause(s) that are hypothesized to have favored their establishment. © The Willi Hennig Society 2007." @default.
- W2111380507 created "2016-06-24" @default.
- W2111380507 creator A5009406666 @default.
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- W2111380507 date "2007-04-01" @default.
- W2111380507 modified "2023-09-26" @default.
- W2111380507 title "A method for constraining the age of origination of derived characters" @default.
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- W2111380507 doi "https://doi.org/10.1111/j.1096-0031.2006.00129.x" @default.
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