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- W2155481488 abstract "The clade Talpidae consists of specialized fossorial forms, shrew-like moles and semi-aquatic desmans. As with all higher jawed vertebrates, different functional, phylogenetic and developmental constraints act on different parts of dentary influencing its shape. In order to determine whether morphological variation in the dentary was unified or dispersed into an integrated complex of structural–functional components, a morphometric analysis of the mole dentary was undertaken. The dentary was subdivided into component parts–horizonal ramus; coronoid, condylar, angular processes of the ascending ramus–and outline-based geometric morphometric methods used to quantify, compare and contrast modes of shape variation within the clade. These were successful in revealing subtle differences and aspects of shape important in distinguishing between mole genera. Closer examination of shape variation within the two fully fossorial mole clades (Talpini and Scalopini) revealed several similarities in ascending ramus shapes between genera from each clade. For example, the broad, truncated appearance of the coronoid process in the talpine genera Talpa and Parascalops was shared with the scalopine genus Scapanus. Also, the more slender, hook-shaped coronoid process of Euroscaptor and Parascaptor (Talpini) closely resembles that of Scalopus (Scalopini). Interestingly, subspecies (one from each clade) more closely resembled genera other than their own in coronoid process shape. Important distinctions in horizontal ramus shape were found to exist between the two clades, such as the extent of curvature of the ventral margin and relative depth of the horizontal ramus. Results show shape variation in this region is correlated with dental formulae and the relative sizes of the teeth. The taxonomically important dentition differences characteristic of mammals are also reflected in the horizontal ramus results. Moreover, these results suggest size may be affecting shape and the extent of variation in, for example, the coronoid and condylar processes between the semi-aquatic moles Desmana and Galemys. It is likely that the effects of morphological integration seen at this level of analysis - covariation between shapes of dentary components - may exist because interacting traits are evolving together. Horizontal ramus and coronoid process shape, for example, are similar across Scapanus and Parascalops, but both these shapes have diverged in Scalopus." @default.
- W2155481488 created "2016-06-24" @default.
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- W2155481488 date "2008-05-01" @default.
- W2155481488 modified "2023-10-14" @default.
- W2155481488 title "Shape variation in the mole dentary (Talpidae: Mammalia)" @default.
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- W2155481488 doi "https://doi.org/10.1111/j.1096-3642.2008.00376.x" @default.
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