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Abstract
The intra-specific variations of the setae arrangements was evaluated in three populations of Eisenia fetida (Savigny, 1826), e.g., to apply and test of the usefulness of setal formula at the intra-specific (population) level. The results confirm the role of the expected geographic isolation on the inter-population variability, and the results showed that variability in the setal formula (variability in paired setae groups aa, ab, and dd) could be used in the study of the intra-specific variations.