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Figure 4 | BMC Evolutionary Biology

Figure 4

From: Evolutionary implications of the divergent long bone histologies of Nothosaurus and Pistosaurus(Sauropterygia, Triassic)

Figure 4

Overview photographs of Nothosaurus femur thin sections in normal light. A-D, diaphyseal sections. In all images, ventral is at the bottom. A, N. giganteus femur (SIPB R 49); B-C, Nothosaurus mirabilis femora (SIPB R 54/1, SIPB R 50/2); D, Nothosaurus sp. indet. femur (SMNS 84856). In contrast to the triangular Nothosaurus humeri, femora have approximately round cross sections. In the femora in A and C, strong remodeling and a tendency for expansion of the medullary region are visible. The femur in D is clearly osteosclerotic, and the one in B also shows some osteosclerosis.

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