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The karyotype of freshwater redclaw crayfish Cherax quadricarinatus (von Martens) was studied by examining metaphase chromosome spreads from the testis tissues. A total of 79 mitotic metaphases were examined and the diploid chromosome number ranged from 188 to 203 per metaphase with a mode at 200, representing 25.8% of the metaphases. The number of bivalents varied from 88 to 103 with a mode at 100,...
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