Figure 1
From: Breeding Young as a Survival Strategy during Earth’s Greatest Mass Extinction
Osteohistological sections of Permian (a–c) and Triassic (d–f) late subadult or adult therapsids. Numerous growth marks (arrows) characterise Permian taxa, whereas two, but generally no growth marks characterise Early Triassic taxa. (a) Dicynodont Lystrosaurus maccaigi, humerus NMQR 3663a. (b) Therocephalian Moschorhinus, humerus NMQR 3939a. (c) Cynodont Procynosuchus, radius BP/1/3747. (d) Lystrosaurus murrayi, humerus BP/1/3236. (e) Moschorhinus, humerus BP/1/4227a. (f) Cynodont Thrinaxodon, radius BP/1/4282a. Scale bars equal 1000 μm (a,b,d); 500 μm (e); 100 μm (c,f).
