FIGURE 8. Close-up RTIViewer snapshots of the region ventral to the zeugopodial bones of the right wing on the counter slab, taken under different lighting conditions, but all processed using the specular enhancement mode (except for 8A). Scale bar for all illustrations equals 10 mm, except for 8E (1 mm). Markings for various pycnofibre types used throughout this Figure: the location of aktinofibrils impressions is marked by a red rectangle, the direction in which pycnofibre impressions point is highlighted by red arrows, the Type 2 pycnofibre is illustrated by a red circle. 8A. The whitish amorphous rock surface with pycnofibres between the zeugopodial bones of the right wing (upper right corner) and the first two phalanges of the right wing finger (lower left corner). Note first type pycnofibre impressions (red lines). The locality of overlapping impressions is marked by an orange circle in 8A and 8B (although not well visible in the image). 8B. Idealised sketch of Figure 8A after comparing several RTI images with each other to better visualise the trend of the decreasing abundance of crossing/ overlapping pycnofibres. Note that a trend of opposing impression directions seems to exist in this area of the counter slab (see the two red arrows). 8C. Specular enhancement image depicting the lower image part of 8A encompassing a wider field of vision. Aktinofibrils-like impressions heading for the lower right edge of the image (red arrows within the orange rectangle). 8D. Sketch of 8C. 8E. Enlarged close-up of the Type 2 pycnofibre. A much smaller terminal bifurcation is indicated (red arrow), suggesting that it might even be another type of bifurcated pycnofibre. 8F. Sketch of 8E, illustrating the smaller terminal bifurcation (yellow circle). 8G, 8I. The inconsistent appearance of the pycnofibres directly ventral to the articulation of the metacarpal bones with the phalanges of the right wing finger, taking on interesting shapes depending on the direction of incident light (red oval in 8G and also indicated in 8H). At some places, the pycnofibre impressions cross each other at specific angles (marked by two red angles in 8G and 8I). 8H. Sketch of 8G to highlight the oval shape of an accumulation of impressions.

Published as part of Henkemeier, Nils, Jäger, Kai R.K. & Sander, P. Martin, 2023, Redescription of soft tissue preservation in the holotype of Scaphognathus crassirostris (Goldfuss, 1831) using reflectance transformation imaging, pp. 1-40 in Palaeontologia Electronica (a16) 26 (2) on page 18, DOI: 10.26879/1070, http://zenodo.org/record/11063386