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Four spiny lobster species, Japanese (Panulirus japonicus), Hawaiian (P. marginatus) Asian (P. homarus), and New Zealand (Jasus edwardsii, were used for the study. These specimens were obtained from Shizuoka Prefecture, Japan (P.J.), Oahu Island, Hawaii, U.S.A. (P.m.), Indonesia (P.h.) and Wellington, New Zealand (J.e.). The chromosome observations were carried out using a routine air-drying method...