Tetraploids of the lung flukeParagonimus westermani found in China (original) (raw)

Abstract

Two groups of_Paragonimus westermani_ (Tematoda: Platyhelminthes) exist in nature: diploids and triploids. Generally, these two groups live allopatrically, but in Kuandian, Liaoning Province, in the Republic of China, they live sympatrically. In our Chinese experiment on_Paragonimus_ we used metacercariae of_P. westermani_, which we collected in Kuandian, Xigutai, and performed a cytological analysis. The results were as follows: (1) the_P. westermani_ in Xigutai lived sympatrically as diploids and triploids; (2) all of the small metacercariae were diploids; (3) the large metacercariae were in large proportion triploids; (4) we found one tetraploid specimen in both the medium and the large metacercariae — this was the first time tetraploid lung flukes were discovered; (5) the somatic chromosomes of the tetraploids were different in numbers (4_n_=44), but we could not find any difference in the karyotype of haploid sets and that of the diploids and the triploids; (6) unlike the triploids, during their meiosis the tetraploids produced a chromosome pairing, and we found a tendency of the large chromosomes to become quadrivalent; and (7) also unlike the triploids, a great number of spermatids were found in the tetraploid testes. Because of these findings, we can consider tetraploids to be autotetraploids, and these are probably produced by the fertilization of diploids and triploids. We also think that the gametes of tetraploids have a fertilization capability.

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Authors and Affiliations

1. Laboratory of Biology, St. Mary's Junior College, Tsubuku-Honmachi, Kurume City, Fukuoka 830, Japan
   K. Terasaki
2. Department of Parasitology, School of Medicine, Fukuoka University, 814-01, Fukuoka City, Fukuoka, Japan
   S. Habe
3. People's Hospital, Beijin Medical University, 100034, Beijin, Peoples Republic of China
   L. Ho & H. Jian
4. Department of Parasitology, Kochi Medical School, Nankoku City, Kochi 783, Japan
   T. Agatsuma
5. Laboratory Animal Research Center, Tottori University, School of Medicine, Yonago City, Tottori 683, Japan
   T. Shibahara
6. Department of Parasitology, National Institute of Health, Kamiosaki, Shinagawa-Ku, Tokyo 141, Japan
   H. Sugiyama
7. School of Health Sciences, Kyushu University, Fukuoka City, Fukuoka 812, Japan
   K. Kawashima

Authors

1. K. Terasaki
2. S. Habe
3. L. Ho
4. H. Jian
5. T. Agatsuma
6. T. Shibahara
7. H. Sugiyama
8. K. Kawashima

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Terasaki, K., Habe, S., Ho, L. et al. Tetraploids of the lung fluke_Paragonimus westermani_ found in China.Parasitol Res 81, 627–630 (1995). https://doi.org/10.1007/BF00932031

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• Received: 20 September 1994
• Accepted: 17 November 1994
• Issue date: July 1995
• DOI: https://doi.org/10.1007/BF00932031

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