Abstract
Different sex-determining mechanisms (♂: XO; X1X2O; X1X2X3O) were studied in species of the Lycosidae family, named for the purpose of description as follows: Lycosa sp.1 (malitiosa group), Lycosa thorelli Keyserling, Lycosa sp.2 (thorelli group) and Lycosa sp.3. While L. sp.1 (malitiosa group) shows a single metacentric sex-chromosome, L. thorelli and L. sp.3 present a multiple system (X1X2O). A new system (X1X2X3O) was found in L. sp.2 (thorelli group) (coexisting with L. thorelli in the same habitat). Its particular behaviour during meiotic prophase is discussed. The sex-chromosome lengths were compared in the statistical analysis. An anova test with two unequal classes (Group A = sex-chromosomes from X1X2O species; Group B = sex-chromosomes from X1X2X3O species) and the additional component variance were used for quantitative comparisons. A non-disjunction phenomenon in the second male meiosis is postulated as the origin of specimens with an X1X2X3O sex-determining mechanism.
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Postiglioni, A., Brum-Zorrilla, N. Karyological studies on Uruguayan spiders II. Sex chromosomes in spiders of the genus Lycosa (Araneae-Lycosidae). Genetica 56, 47–53 (1981). https://doi.org/10.1007/BF00126929
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DOI: https://doi.org/10.1007/BF00126929