Futakami and Haggart—early Albian (Early Cretaceous) douvilleiceratid ammonites
D. mammillatum zones of the lower to upper lower Albian in England.
Douvilleiceras populations of Haida Gwaii demonstrate
that species of the genus are characterized by appreciable morphological variation, particularly with respect to the shape of the whorl and the pattern of ribbing and tuberculation. Morphological variation is most accentuated in the middle growth stage, approximately 50 or 60mm to 100mm in shell diameter, with earlier and later growth-stages showing less distinctive features. The most useful criteria for differentiat- ing species within the genus Douvilleiceras are the mode of tuberculation and ribbing, as well as overall shell proportions, of the middle growth stage.
Acknowledgments
We thank the late Mr. Yoshitaro Kawashita, who helped us collect specimens on Haida Gwaii, and Mr. Rod Bartlett (Vancouver), who provided expert specimen preparation. Hillary Taylor and Peter Krauss provided help with graphics and photo production and Fontaine Hwang and Diane Thompson provided assistance in obtaining critical literature.We are much indebted to the late Emeritus Prof. Tatsuro Matsumoto (Kyushu University), as well as Drs. Ikuwo Obata (National Science Museum, Tokyo; deceased), Hugh G. Owen (Natural History Museum, London), and Terry P. Poulton (Geological Survey of Canada, Calgary) for their critical readings of early drafts of the manuscript and for providing valuable comments on systematics. The manuscript was also improved significantly through the contributions of Dr. Hugh Owen and we extend our sincere thanks for his effort. This study was carried out with the financial support of Kawamura Gakuen Woman’s University (Abiko) and the Geological Survey of Canada (Project 880038). This paper is a contribution of IGCP Project 362 and also Geological Survey of Canada Contribution 2005312.
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