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Fig. 1. Normal larval development of Helisoma trivolvis (n=215) and Lymnaea stagnalis (n=340) from the trochophore stage till the adult-like form showing interrelations between timing of embryogenesis in percents (lower x-axis), developmental stages after Mescheriakov (Mescheriakov, 1990) (upper x-axis), and the length of embryos (y-axis).





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