Oudenodon (Botha, 2003)

Botha-Brink, Jennifer & Angielczyk, Kenneth D., 2010, Do extraordinarily high growth rates in Permo-Triassic dicynodonts (Therapsida, Anomodontia) explain their success before and after the end-Permian extinction?, Zoological Journal of the Linnean Society 160 (2), pp. 341-365 : 351

OUDENODON

Botha (2003) examined several humeri, femora, tibiae, and fibulae to assess the bone tissue of Oudenodon and thus, only a summary will be given here. The limb bones of Oudenodon exhibit a relatively thick cortex (average femoral cortical thickness 41%; Table 2) and comprise rapidly deposited fibrolamellar bone, interrupted by annuli or sometimes LAGs, becoming slowly deposited parallel-fibred bone towards the periphery ( Fig. 3E ). Although generally similar to Tropidostoma , Oudenodon differs from that taxon in that the parallel-fibred regions are not as prominent even in the ontogenetically older specimens. Sharpey’s fibres were noted in the femora and fibulae ( Botha, 2003), and enlarged channels are absent.

Figures

Figure 3. Permo-Triassic dicynodont bone histology. A, subadult Cistecephalus ulna NMQR1465b; B, early subadult Dicynodontoides tibia NMQR479a; C, adult Rhachiocephalus ulna SAM-PK-3714a; D, subadult Tropidostoma tibia SAM-PK-K9960c; E, adult Oudenodon femur SAM-PK-K4807a; F, adult Aulacephalodon femur NMQR3016. Arrows indicate enlarged midcortical channels in Rhachiocephalus and Aulacephalodon. Scale bars: A, D, E = 500 mm; B, C, F = 413 mm.