Karyotype of S. sipylus was earlier described  and chromosome number determined as 4n = 80 published by More . Despite the selection of metaphase plates for chromosome analysis according to features suggesting their unbrokenness, the chromosome number in metaphase plates varied in this study from 53 to 71. The chromosome plates of analyzed embryos included two pairs of large metacentrics, remaining chromosomes were submetacentics, varying in size from medium to small. Besides pericentric C-positive regions, C-bands were present in telomeric position of some chromosomes. In different chromosomes, they were in short or long arms. In a few chromosomes, interstitial C-positive regions were also identified. One pair of the large metacentrics was characterized with a large C-positive region. It was separated by a pericentric C-band with a small C-negative region similar in size to the short arm of medium acrocentrics (Figure 4a). According to the data obtained here this species is not tetraploid (Figure 2b).