Articles | Volume 21, issue 1
Foss. Rec., 21, 109–118, 2018
Foss. Rec., 21, 109–118, 2018

Research article 03 Apr 2018

Research article | 03 Apr 2018

A case study of developmental palaeontology in Stereosternum tumidum (Mesosauridae, Parareptilia)

Constanze Bickelmann and Linda A. Tsuji

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Cited articles

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Berman, D. S., Reisz, R. R., Scott, D., Henrici, A. C., Sumida, S. S., and Martens, T.: Early Permian Bipedal Reptile, Science, 290, 969–972, 2000. 
Bickelmann, C., Müller, J., and Reisz, R. R.: The enigmatic diapsid Acerosodontosaurus piveteaui (Reptilia: Neodiapsida) from the Upper Permian of Madagascar and the paraphyly of “younginiform” reptiles, Can. J. Earth Sci., 46, 651–661, 2009. 
Bickelmann, C., Mitgutsch, C., Richardson, M. K., de Bakker, M. A. G., Jiménez, R., and Sánchez-Villagra, M. R.: Transcriptional heterochrony in talpid mole autopods, EvoDevo, 3, 16, 2012. 
Bickelmann, C., Jiménez, R., Richardson, M. K., and Sánchez-Villagra, M. R.: Humerus development in moles (Talpidae, Mammalia), Acta Zool.-Stockholm, 95, 283–289, 2014. 
Short summary
Mesosaurs were reptiles that lived around 280 mya. They were the first land reptile group to return to the water. Study of a fossil from the Museum für Naturkunde, Berlin reveals a previously unobserved baby skeleton near the adult. This small skeleton can tell us about how these creatures grew; the lower segment of the hind limb is already proportionally larger than the upper hind limb and the lower and upper forelimbs. This may be because young mesosaurs needed to swim right from birth.