抄録
1) There are no heterochromosomes in Crustacea Isopoda, neither in the male, nor in the female.
2) The haploid chromosome number of the marine Isopoda and of the related terrestrial and freshwater species is 28 or near to 28:
3) The species of the genus Asellus have a haploid chromosome number of 8. These 8 huge elements result from the fusion of the small and d numerous chromosomes of Stenasellus.
4) The chromosome number of the true Oniscoidea (Endophora and Embolophora) is progressively increasing. The chromosome evolution is parallel to the morphological evolution. We can summarize it as follows:
The most extreme terms have the same high chromosome number, while the intermediate species have smaller numbers, resulting from fusions and associations of chromosomes.
