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Spermatogonial and primary spermatocyte chromosomes of Paragomphus lineatus (Selys) and Nepogomphus modestus (Selys) of family Gomphidae have been described on the basis of C-banding and NOR staining. Both the species possess 2n (♂) =23, n (♂) =12 without m chromosomes with XO(♂)/XX(♀) type sex determining mechanism. The sex chromosome is the largest element in the whole complement in Paragomphus lineatus...
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