Pycnodonte (Phygraea) vesiculare aalensis
On the variability of the Campanian Pycnodonte (Phygraea) vesiculare (Lamarck). Neues Jahrbuch fuer Geologie und Palaeontologie Monatshefte, 1, Januar 1998: 42-54. 47 [Zoological Record Volume 135]