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. 2013 Mar 5;3(4):971–984. doi: 10.1002/ece3.521

Figure 2.

Figure 2

Allometric space for 17 squirrel species, comprising representatives from four (Clade II to Clade V) of the five major lineages denoted by Mercer and Roth (2003, Fig. 1). Each species is represented by a single point in allometric space, describing its allometric trajectory. Following Mercer and Roth (2003), Clade II (filled square) is monotypic, Clade III (open circle) comprises the Indo-Malayan tree squirrels (now grouped as Callosciurinae), Clade IV (open triangle) includes the Holarctic Marmotini and African and Central Asian Xerini in addition to nearly all tree squirrels from Africa, Clade V (filled circle) includes flying squirrels, all New World and some Old World tree squirrels. Habit groupings are denoted in the bottom left corner: flying (dashed solid line), ground (solid line), and tree (no line). PC1 = 25.5% and PC2 = 15.2% of sample variance.