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Karyological analysis of cylindera trisignata latreille and dejean 1822 from portugal coleoptera cicindelidae



Karyological analysis of cylindera trisignata latreille and dejean 1822 from portugal coleoptera cicindelidae



Genetica 82(2): 79-84



Cellular suspensions of germinal tissues of Cylindera trisignata provided the definition of its karyotype: 2n = 23 and 2n = 26 for the males and females respectively. This Palearctic species has a sex chromosome system of the X1X2X3X4Y / X1X1X2X2X3X3X44 type, only found until now in Cicindela maroccana pseudomaroccana. The heterosomes are not well-differentiated from the general morphological standpoint. To explain the origin of the 4X condition, a mechanism of dissociation of the X chromosomes rather than an incorporation of autosomal segments is proposed. However, based on the occurrence of distinct ploidy levels, both in male and female cells, with a relatively high incidence for the tetraploid condition with regular autosomal bivalents, the hypothesis of a possible evolutionary role of polyploidy is suggested.

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Accession: 007498132

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PMID: 2076823


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