The paper has nothing to do with their sex but rather about their resistance to arsenic. Nematodes often exhibit hermaphroditism, which isn’t exactly a third s

The paper has nothing to do with their sex but rather about their resistance to arsenic. Nematodes often exhibit hermaphroditism, which isn’t exactly a third sex since hermaphrodites have both male and female gonads they still have binary sexual reproduction just with themselves and when reproducing with a male or a female sexually they would act as a female or a male respectively during reproduction. As far as sexual reproduction goes this isn’t 3 sexes that require each other to reproduce or 3 distinct sexes that can reproduce with each other individually.