Examining the allometric space created for sciurids, similar to that previously constructed for muroids and Hystricomorpha (Wilson and Sánchez-Villagra 2010 ), overall a clear trend between taxon spacing and body mass (size) is not evident despite the repeated evolution of dwarf and giant forms that is known to characterize the group (e.g., Mercer and Roth 2003 ; Hautier et al. 2009 ).
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