Fig. 13 in A new type of shell malformation caused by epizoans in Late Jurassic ammonites from Central Russia

Fig. 13. Phosphatic layer on the surface of the craspeditid ammonite Kachpurites fulgens (Trautschold, 1861) shell from the Late Volgian, K. fulgens Zone, Eganovo locality, Moscow region, Central Russia. Specimen MSU 118/17) with fragments of a thin brown phosphate layer on the surface of the shell (presumably remnants of the periostracum) in lateral (A) and ventral (B) views. A narrow dark band is visible on the venter (arrows).