The diploid chromosome numbers and karyotypes of
Pracambarus clarkii and
Nephrops japonicus are described by an air-drying method. The diploid chromosome number of
P. clarkii is one hundred and eighty-eight (2
n=188) in both the male and the female, among which forty-two meta- and submetacentric and fifty-two subtelo- and acrocentric pairs are included. The diploid chromosome number of
N. japonicus is one hundred and thirty-six (2
n=136) in both the male and the female, among which forty-six meta- and submetacentric and twenty-two subtelo- and acrocentric pairs are included. One subtelocentric pair of
N. japonicus is remarkably large as compared with other pairs. The large chromosome pair is not found in
P. clakii.
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