BIOTIC References
278Weber, L.I., Gray, D.R., Hodgson, A.N., & Hawkins, S.J., 1997. Genetic divergence between South African Helcion species and North Atlantic Helcion pellucidum (Mollusca: Patellogastropoda). Journal of the Marine Biological Association of the United Kingdom, 77, 1139-1150.
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