《Table 2 Morphometric data of the chromosomes of Blepharipoda liberate (averages of 11-cell spreads)

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《"Karyological analysis of the sea cicada Blepharipoda liberate Shen from the Rizhao intertidal zone, China"》

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m:metacentric；sm:submetacentric；st:subtelocentric；t:telocentric.Metacentric and submetacentric were considered as two-armed and subtelocentric and telocentric as a single-armed（NF=184）.

A total of 218 well-spread mitotic metaphase chromosome sets were examined to determine the diploid chromosome mode number:183 were from zoea-larvae cells，23 were from gill cells，and 12 were from the gonad cells of adult females.The modal diploid number（2 n）was 106，the numerical variations in the chromosome numbers ranged from 81 to 113，with a mode of 106.We found it easier to investigate chromosomes from larvae cells than gill or gonad cells of adult females，but larval chromosomes were easily lost during preparation（Table 1）.Eleven wellspread metaphase chromosome sets were used for karyotype analysis；the karyogram consisted of 25 metacentric，14 submetacentric，11 subtelocentric，and 3 telocentric pairs，and we found no heteromorphosis sex chromosomes.The arm number was 184，and the chromosomes varied in size from0.85 to 4.97μm（Table 2）.A well-spread metaphase plate，and the karyogram of the 106 chromosomes from a larvae cell are shown in Fig.4 and Fig.5，respectively.A well-spread metaphase plate from gill cells is shown in Fig.6.