Figure 2
From: An ancestral hard-shelled sea turtle with a mosaic of soft skin and scutes
Structure of DK 807 hind limb soft tissues. (a) Photograph of the right hind flipper of DK 807. Approximate areas from where samples were taken from the counterslab for analysis are demarcated by white circles (g,h). (b) Sketch image of some key features of the flipper, with brown indicating epidermal tissues, grey sediment, white bone, and black dermal remains. Lineations are interpreted as folded tissue residues. (c,d) Close-up photographs of multiple skin folds. The locations of these folds are denoted by corresponding arrows in (a). (e,f) Patches of concentrated black matter within the flipper soft tissue, interpreted as dermal residues. (g) Image of sampled flipper residue demineralized using EDTA. (h) Photograph of a liberated sheet of organic matter following treatment with hydrofluoric acid. Note multiple lineations (folded tissue residues) denoted by white double arrowheads in (g) and (h). Scale bars, 1 mm (g,h).
