Long Bone Histology of Sauropterygia from the Lower Muschelkalk of the Germanic Basin Provides Unexpected Implications for Phylogeny (original) (raw)
Figure 13
Bone tissue of placodonts, and femur cross sections showing histotype A and B bone tissue.
A–B) Composite of cross section of placodont humerus IGWH-9 in A) normal and B) polarized light. C–E) Enlargement of the dorsal side of the cross section of placodont femur IGWH-23 in C) normal, D) polarized light, and E) polarized light combined with gypsum filter. The arrow in C) marks the beginning and direction of the diffuse medullary cavity. F–Q) Femur cross sections showing histotype A bone tissue. F–H) Cross section of femur NME48000074 in F) normal light, G) polarized light, and H) polarized light combined with gypsum filter. I–K) Composite of femur IGWH-24 in I) normal light, J) polarized light, and K) polarized light combined with gypsum filter. L–N) Cross section of femur IGWH-2 in L) normal light, M) polarized light, and N) polarized light combined with gypsum filter. O–Q) Cross section of femur IGWH-5 in O) normal light, P) polarized light, and Q) polarized light combined with gypsum filter. R–Z) Femur cross sections showing histotype B bone tissue. R–T) Cross section of femur Wijk-A568 in R) normal light, S) polarized light, and T) polarized light combined with gypsum filter. U–W) Cross section of femur Wijk-06-102 in U) normal light, V) polarized light, and W) polarized light combined with gypsum filter. X–Z) Cross section of femur Wijk-08-150 in X) normal light, Y) polarized light, and Z) polarized light combined with gypsum filter. Orientation in IGWH-2 and Wijk-A568 is uncertain. Wijk08-150 and Wijk06-102 are laterally compressed.