Conway Morris, S. and Fritz, W. H. 1984. Lapworthella piligrana n.sp. (incertae sedis) from the Lower Cambrian of the Cassiar Mountains, Northern British Columbia, Canada, with comments on possible levels of cometition in the early Cambrian. Palaeontologische Zeitschrift 58(3/4): 197-209.
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Conway Morris, S.; Fritz, W. H.
1984
Lapworthella piligrana n.sp. (incertae sedis) from the Lower Cambrian of the Cassiar Mountains, Northern British Columbia, Canada, with comments on possible levels of cometition in the early Cambrian