On the karyotype of a laboratory Trichinella strain from Bulgaria.

The karyotype of male and female individuals of the species Trichinella nelsoni was studied. It was found that the number of chromosomes in females individuals is 2n = 6 and in males 2n = 5. Each pair of chromosomes differs from one another as to dimensions and location of the centromere. The univalent chromosome that was found in the chromosome set containing five chromosomes is the second largest submetacentric chromosome. It is suggested that this chromosome is the sex chromome of the studied Trichinellae.