Tooth plates in chimaeras and their relationship to teeth in sharks

Dear Evgeny, Thank you for the support. Eventually i would like to get the dentitions of the chimaeroid species I have get photographed and published. There is often quite a lot of infraspecific variation in tooth plate form, especially ontigenetic, and that has not been recorded properly since Dean. The fin spine is probably from the maastrichtian although we need to look at the matrix. An Edaphodon-like mandibular that David got some years ago may be the same species.