The denticles are characterised by wide blade and sickle-shaped provided by apophysis on blade connection with the central part (Figure 1a). The blade fills the space between y and y - 1 axes. Central part robust ending rounded fitting on the next denticle filling the space between y and y - 1 axes. Ray long, robust, slightly directed anteriorly situated between the axes y and y + 1, tapering rounded provided by a relatively short apophysis (Figure 1b). Several specimens studied showed inconstant shape and length of ray.