1942  Pennoceras seamani Miller & Unklesbay: 147, fig.2B;  pl.8,fig.7-13.
     1996  Pennoceras seamani.-Davis & Mapes: 174, Fig.14-8, 5-6, 14-10, 3.
     1997  Pennoceras seamani.-Mapes et al.: 218, text-fig.2-16-17, pl.2-1 fig.11, 13.
     2007  Pennoceras seamani.-Work, Boardman & Mapes: 591, fig.2, 3.5, 3.6, 5.

Lectotype [Mapes, Windle, Sturgeon & Hoare, 1997, p.219] CMNH 22292.

Fig. see  TAX5528 D (suture).