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Landman, Polizzotto & Mapes |
2006 |
Cameral membranses in prolecantid and goniatitid ammonoids from the Permian Arcturus Formation, Nevada, USA. [N.H. Landman, K. Polizzotto, R.J. Mapes & K. Tanabe].
Lethaia, 39: 365-379, 13 fig.
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Tanabe, Mapes & Sasaki |
2000 |
Soft-part anatomy of the siphuncle in Permian prolecanitid ammonoids. [K.Tanabe, R.H.Mapes, T.Sasaki & N.Landman].
Lethaia, 33: 83-91, 8 fig., Oslo.
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Tharalson |
1984 |
Revision of the Early Permian ammonoid family Perrinitidae.
Journal of Paleontology, 58 (3): 804-833, fig.1-24, 1tab.; Lawrence, Kansas.
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