1971  Pachylyroceras constrictum Ruzentsev & Bogoslovskaya:
           247, pl.21 fig.9,10, pl.23 fig.1,2.
     1994  Pachylyroceras constrictum.-Nikolaeva: 81, pl.5
           fig.8, textfig.33,b.
     1995  Pachylyroceras constrictum.-Nikolaeva: 60, pl.4
           fig.18-19, textfig.46.

Fig. see TAX2256 D-E (sutures).