Sipyloidea sipylus (Southeast Asia; also, due to humans, Madagascar) was first described in 1859 , and established lab strains are mainly parthenogenetic; in the wild, bisexual populations can also be found. The first description of its karyotype was published in 1967 . In females the chromosome number was determined initially to be 80 ± 2 and it was suggested that S. sipylus is tetraploid . Later, the chromosome number in S. sipylus was listed as 4n = 80 .