FIGURE 9 in Redescription of soft tissue preservation in the holotype of Scaphognathus crassirostris (Goldfuss, 1831) using reflectance transformation imaging

FIGURE 9. Close-ups of RTIViewer snapshots of the region ventral to the cervical vertebral column and at the articulation of the first with the second phalanx of the right wing finger on the main slab, processed without (9A and 9D) and with the specular enhancement mode (9B and 9E). Scale bar for all illustrations equals 10 mm. Markings for various pycnofibre types used throughout this Figure: The Type 2 (bifurcated) pycnofibre type is marked by a red rectangle, orange-brown sediment surfaces on which the aktinofibrils impressions are to be found are illustrated by a red rectangle and a red ellipse. The suggested border of the partly preserved wing membrane after Jäger et al. (2018) is also marked (red transversal line). 9A. The whitish amorphous rock surface ventral to the cervical vertebral column. 9B. Specular enhancement image of 9A. Frequent occurrence of pycnofibres marked by a red triangle. The pycnofibre accumulation within the red circle might represent closely spaced neighbouring bifurcated Type 2 pycnofibres (pointed out by a red arrow). 9C. Interpretative drawing of 9B. 9D. Aktinofibril impressions close to the articulation of the first with the second phalanx of the right wing finger, especially well preserved within two orange-brown sediment surfaces. Also note the presence of aktinofibrils on the surface of the phalanges, visible in 9D as well as in 9E (recognisable by a grooved bony surface). 9E. Specular enhancement image of 9D. Aktinofibrils beyond the patagium border (and therefore laying on the bone surface of the phalanges) indicate their taphonomical displacement. 9F. Interpretative drawing of 9E demonstrating the spatial arrangement of the aktinofibril impressions. Not shown are the aktinofibrils on the bone surface.