The early Albian to mid-Albian cosmopolitan genus Douvilleiceras is represented in the Haida Gwaii archipelago of western British Columbia by five species, D. mammillatum (Schlotheim), D. offarcinatum (White), D. scabrosum Casey, D. spiniferum (Whiteaves), and D. aff. spiniferum (Whiteaves). Specimens of one of these taxa, D. spiniferum, are particularly abundant on Haida Gwaii and the species is discussed with respect to its morphological variability and ontogenetic development. The important morphological features for taxonomic criteria of the genus Douvilleiceras are the mode of tuberculation, the pattern of ribbing, and the proportions of the shell in the middle growth stage.
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Vol. 90 • No. 1