Key words: Reptilia, Dinosauria, bone histology, fibrolamellar bone, primary osteon, secondary osteon, Triassic, England.

Ragna Redelstorff [ragna.redelstorff@uct.ac.za], Zoology Department, University of Cape Town, Private Bag X3, Rondebosch, 7701, Cape Town, South Africa; P. Martin Sander [martin.sander@uni-bonn.de], Steinmann Institute for Geology, Mineralogy and Palaeontology, University of Bonn, Nussallee 8, 53115 Bonn, Germany; Peter M. Galton [pgalton@bridgeport.edu] College of Naturopathic Medicine, University of Bridgeport, Bridgeport, Connecticut, USA; home address: 1065 Vintage Drive, 94572 Rio Vista, California, USA.