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Figure 2 | BMC Evolutionary Biology

Figure 2

From: Qualitative skeletal correlates of wing shape in extant birds (Aves: Neoaves)

Figure 2

Biplots of bone morphology characters on successive PCO axes. Insets show bone feature loadings on Principal Coordinate Axes (a) 1-2, (b) 3-4, (c) 5-6, and (d) 7-8. drp: dorsal remigial papillae; crp: caudal remigial papillae; dpf: dorsal phalangeal fossae; iip1: presence/absence of internal index process; iip2: shape of internal index process; fp: flexor process digit III.

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