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Fig. 7. Loligo opalescens. (A) Linear regression of dorsal mantle length (ML) from a ratio of ML upon eye diameter (ED). y=–85.285+18.205x; r2=0.857, P<0.001, N=157. (B) Total length, the sum of the dorsal mantle length, the head length and the fourth arm length, can be estimated from the mantle length by the linear regression y=–4.0244+1.6227x; r2=0.978, P<0.001, N=157.