There are 22 species in the genus , 17 species have a dextral bowl and 5 species are sinistral .
There are 22 species in the genus . 17 species have a dextral shell and 5 species are sinistral .
There are 22 species in the genus . 17 species have a dextral shell and 5 species are sinistral .
重写这句话: There are 22 species in the genus , 17 species have a dextral bowl and 5 species are sinistral . 输出: