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The chromosomes from 3 species of Collembola Onychiuridae belonging to the same genus, Onychiurus (Protafthorura), were analyzed. Onychiurus armatus and Onychiurus glebatus, with the highest chromosome number in Collembola (2n = 18), have morphologically different karyotypes. The diploid chromosome number of Onychiurus quadriocellatus is 2n = 16. There are not numerical differences between the two sexes. The taxonomic and evolutive significances of the unusual numerical differences within a collembolan...
The Lernaeid parasites of Carassius auratus, Cyprinus carpio, Lepomis gibbosus and Gambusia affinis, collected in Italy, belong to the same species: Lernaea cyprinacea L.. This is proved by the karyologic analysis (2n = 16 in all specimens) and by the variation of the anchor shape. There are no polyploid cells in L. cyprinacea embryos and sexual differences in chromosome number are lacking.
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