1914  Protactoclymenia involuta var. crassa Wedekind: 21,
           pl.1 fig.10.
     1944  Cyrtoclymenia involuta var. crassa.-Kind: 146, pl.1
           fig.2,2a.
     1953  Cyrtoclymenia involuta var. crassa.-Nalivkina: 102,
           pl.3 fig.9-11.