The chromosome numbers and karyotypes of Dugesia sp.from Limufeng,Heilanqiao and Tianchi of Hainan Island were studied with air-drying method.The results show that the cardinal number of chromosome of Dugesia sp.from 3 localities of Hainan Island is 8.The most cells of Dugesia sp.from Limufeng have the diploid chromosome number of 16 with the karyotype formula of 2 n=2 x=16=16 mand the percentage of diploid cells is 82.24%.The most cells of Dugesiasp.from Heilanqiao have the tiploid chromosome number of 24 ...