Abstract
AbstractThe early Albian to mid-Albian cosmopolitan genusDouvilleicerasis represented in the Haida Gwaii archipelago of western British Columbia by five species,D.mammillatum(Schlotheim),D.offarcinatum(White),D.scabrosumCasey,D.spiniferum(Whiteaves), andD. 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 genusDouvilleicerasare the mode of tuberculation, the pattern of ribbing, and the proportions of the shell in the middle growth stage.
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