Stepanov Sergei Alexandrovich RussiaSaratovSaratov State Medical University named after V. I. Razumovsky, 112 Bolshaya Kazachia St., Saratov 410012, Russiapaleozoo@san.ru Author's articles On Paleopathology of the Upper Cretaceous Plesiosauroid Sauropterygians of the Lower Volga-Region