FIGURE 7 in Redescription of soft tissue preservation in the holotype of Scaphognathus crassirostris (Goldfuss, 1831) using reflectance transformation imaging

FIGURE 7. Close-ups of RTIViewer snapshots of the region ventral to the zeugopodial bones of the right wing on the main slab, taken under different lighting conditions, but all processed using the specular enhancement mode (except for 7D and 7G). Scale bar for all illustrations equals 10 mm, except for Figure 7A (1 mm). Markings for various pycnofibre types used throughout this figure: red circle illustrating Type 5 (the tuft); red arrows highlighting the main branch and several side branches of Type 6 (feather-like) as well as the individual path of single pycnofibre impressions at the lower margin of the main slab (Fig. 7C). For better comparability, the outermost (longest) side branches of the "feather" are highlighted by red markings (inclusive all terminal bifurcations). 7A. Type 5 pycnofibre. Some impressions suggest a connection between the Type 5 and 6 pycnofibres, but are not consistent in their appearance. 7B. Schematic drawing of Figure 7A, showing possible connections between the tuft and neighbouring grooves (see red arrows, although not entirely confirmable by the RTI images). 7C. The accumulation of Type 1 pycnofibres at the edge of the main slab near the articulation of the first with the second phalanx of the right wing finger (towards the lower right corner). Red arrows indicate the opposing directions of the impressions. Note in the upper right image corner the sixth pycnofibre type of Figure 7D-7I (green circle). 7D. Type 6 pycnofibre, dorsal to the articulation of the first with the second phalanx of the right wing finger (lower right image corner). Some side branches bear even smaller ones (red parabola-like upside-down markings in Figure 7D, 7E and 7H). 7E. Specular enhancement image of the sixth type. 7F. Interpretative sketch of 7E, highlighting the similarity with a feather as Goldfuss (1831) previously pointed out. The extent, length and number of several side branches are difficult to determine. Therefore, the drawing may differ in some details from the structure visible in the RTI images.7G-7H. The feather-like pycnofibre impression from a greater distance under normal light (7G) and processed by using the specular enhancement mode (7H). 7I. Sketch of Figure 7G and 7H, suggesting no real connection between the Type 5 (tuft) and Type 6 (feather) pycnofibres.