Figure 2
From: Evidence corroborates identity of isolated fossil feather as a wing covert of Archaeopteryx
(a) Relative calamus lengths of modern feathers and the isolated fossil feather (red), in descending order. In both the plot (Gallus) and wing (Archaeopteryx), black represents UMPCs, dark grey represents primaries, and light grey represents secondaries and upper major secondary coverts (UMSCs), as well as rectrices (tail feathers) and alulars (not present in Archaeopteryx). UMPCs are statistically significantly longer than all other tracts. Inset: anatomical reference illustrating dorsal view of the left wing of Archaeopteryx (modified from Carney et al. 20129; based on Wellnhofer 20094, 20085). Note that there are 12 primaries reconstructed in Archaeopteryx and 10 primaries in Gallus. See Supplementary Fig. S12 for anatomical reference of Gallus wing and the relative calamus lengths grouped by tract. (b) Schematic of the enumerated anatomical attributes.
