FIGURE 6 in Redescription of soft tissue preservation in the holotype of Scaphognathus crassirostris (Goldfuss, 1831) using reflectance transformation imaging

FIGURE 6. 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 6A and 6H). Scale bar for all illustrations equals 10 mm, except for 6G and 6H (one millimetre). Markings for various pycnofibre types used throughout this Figure: Type 2 (bifurcated; yellow circle), Type 3 (trident-like; orange circle), Type 5 (tuft, red circle), and Type 6 (symmetrical "feather", green circle). The path of individual pycnofibre impressions, and the path of individual side branches of single impressions are illustrated by red markings (either by straight lines or by curved arcs as in 6D, 6E, and 6H). 6A, 6C. Overview of the area with the pycnofibres ventral to the zeugopodial bones of the right wing (upper left corner of both images) and the phalanges of the right wing finger (near the right image margin) under normal light (6A) as well as under the specular enhancement mode (6C). 6B. Schematic sketch of Figure 6C, showing the appearance of the pycnofibre impressions under normal light. 6D-6E. Closeups of 6C. Note the parallel to subparallel alignment of several pycnofibre impressions (red vertical lines in 6D and 6E) and the easily detected caudally curved side branches of the Type 4 pycnofibre (red rectangle in 6F). The complex structure with several putative side branches at the right image margin between Type 2 and 3 pycnofibres (red arrow) is more likely to represent an arrangement of overlapping impressions of individual pycnofibres. 6F. Sketch of the RTI images 6D and 6E. 6G. Detailed close-up of the Type 2 pycnofibre, outlined by red markings. 6H. Detailed close-up of the Type 5 pycnofibre. The longest branch in the middle has a distinctive bifurcation (red circle).