Authors Year Title
Gordon 1965 Carboniferous Cephalopods of Arkansas.
Professional Papers, U.S. Geological Survey, 460: 1-322, fig.1-96, pl.1-32; Washington. [imprint 1964].
Miller & Youngquist 1948 The cephalopod fauna of the Mississippian Barnett Formation of Central Texas.
Journal of Paleontology, 22: 649-671, fig.1-3, pl.94-100; Tulsa, Okla.