The karyotype of the lung fluke, Paragonimus siamensis

Abstract

The karyotype of chromosomes obtained from the germ cells of Paragonimus siamensis was analyzed by air-drying technique. The result revealed the diploid number of chromosomes to be 2n=22. The entire chromosomes consisted of one large-sized metacentric, four medium-sized subtelocentrics, three small-sized metacentrics or submetacentrics and three small-sized submeta-centrics or subtelecentrics. The relative arm lengths of the chromosomes were 20.13 ± 1.21, 13.16 ± 0.42, 11.07 ± 0.48, 10.37 ± 0.84, 9.29 ± 0.52, 6.50 ± 0.39, 6.42 ± 0.34, 6.27 ± 0.28, 6.04 ± 0.58, 5.65 ± 0.39 and 5.03 ± 0.40 % respectively. These data were comparable with those of other related species.