02329nas a2200253   4500008004500000020001400045245018200059210006900241260000900310300000900319490000600328520136100334653002601695653002601721653002801747653002701775653003001802653002601832653002801858100002301886700001201909700001901921856013501940       2008                        Engldsh    a1993-077100aMitotic and meiotic studies of seven Caribbean weevils: difference of sex bivalent compaction at pachynema between Curculionidae and Dryophthoridae (Insecta: Coleoptera) species0 aMitotic and meiotic studies of seven Caribbean weevils differenc  c2008  a7-200 v23 aThe mitotic and meiotic karyotypes of seven species of Caribbean weevils are reported. Three species belong to the Dryophthoridae and four to the Curculionidae families. All are considered as pests for agriculture, and were formerly classified among Curculionidae. The three mitotic karyotypes of the Dryophthoridae species differ in their chromosome number and morphology while those of the four Curculionidae species are fairly similar and can be distinguished by heterochromatin variations or NOR location only. Diakineses/Metaphases I of all species exhibit a parachute sex bivalent and the same range of autosomal bivalent compaction. At contrast, at the pachytene stage, bivalents appear less compact in Curculionidae than in Dryophthoridae species, and this difference is particularly clear for the sex bivalent: at early-mid pachytene stage, chromosomes X and Y are elongated and in end-to-end association in Curculionidae while they form a rounded dense body in Dryophthoridae species. In both conditions, the sex chromosomes are embedded in argyrophilic proteins. The different compactions of the sex chromosomes do not depend on NOR location, either on the X or autosome(s). Thus, bivalent compaction kinetic and/or structure at pachynema may be a taxonomic character, which would give arguments for the split of Curculionidae into two families.10aCosmopolites sordidus10aDiaprepes abbreviatus10aDiaprepes marginicollis10aExophthalmus famelicus10aExophthalmus quadritaenia10aMetamasius hemipterus10aRhynchophorus palmarum.1 aDutrillaux, A., M.1 aXie, H.1 aDutrillaux, B.  uhttps://weevil.myspecies.info/mitotic-and-meiotic-studies-seven-caribbean-weevils-difference-sex-bivalent-compaction-pachynema-bet