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The sperm ultrastructure of Spermophagus kuesteri Schilsky, 1905 (Chrysomelidae, Bruchinae) and considerations on the relationships of Cucujiformia superfamilies.
Micron 2024 March 8
The sperm ultrastructure of the bean-weevil Spermophagus kuesteri (Bruchinae) was studied to verify the congruence of the new position of the subfamily within Chrysomelidae. The results indicated a positive answer to the question supporting a close relationship between Chrysomelidae and Curculionidae, a finding confirmed also by molecular data. Moreover, the sperm morphology of Divales cinctus, a member of Melyridae (Cleroidea) allowed to confirm the different sperm organization between members of this superfamily and Phytophaga (Chrysomeloidea + Curculionoidea). While studying the spermiogenesis of S. kuesteri, some sperm cysts showed aberrant cells provided with two flagella in the same plasma membrane. These aberrant sperm could be the result, during early spermiogenesis, of irregular processes involving the canal rings between spermatids.
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