Fig. 2

PIMUZ A/III 5166, a large saurosphargid thoracic rib with a low uncinate process and sub-triangular osteoderm. Images in b and c show specimen coated in ammonium chloride to enhance surface structures. a Complete specimen on slab of sediment. b Close-up of the slightly expanded holocephalous rib head. Note striation of the bone close to the articular surface. c Close-up of the uncinate process and the osteoderm, the latter exhibiting a slightly pitted surface sculpturing oriented differently than that of the rib. d, e Radiographic image of complete specimen (d) and close-up (e) of the osteoderm. The boundary of rib and osteoderm is indicated by white arrows