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Comparative cytogenetics of Diphyllobothrium ditremum (Creplin, 1925) and Ligula intestinalis (Linnaeus, 1758) (Cestoda: Pseudophyllidea)

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Abstract

An investigation carried out on two species of pseudophyllidean cestodes belonging to different families showed very close karyological affinity between them. The karyotypes of Diphyllobothrium ditremum and Ligula intestinalis both consist of 18 bi-armed chromosomes and are almost identical with respect to the relative length and the centromeric indices of corresponding chromosomes. Statistically significant differences exist in the morphology of chromosomes 2 and 4, but they are not striking and may be due in part to errors of measurement. Differences in the absolute length of the chromosomes were noted: the chromosomes of D. ditremum are somewhat larger (from 2.7 to 8.5 μm) than those of L. intestinalis (from 1.9 to 5.4 μm). The results obtained were compared with data existing for other pseudophyllidean cestodes and preliminary conclusions on the karyotypic evolution in that group of helminths were made.

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  1. Institute of Ecology, Lithuanian Academy of Sciences, Akademijos 2, 2600, Vilnius, Lithuania

    R. Petkevičiūtė

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  1. R. Petkevičiūtė
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Petkevičiūtė, R. Comparative cytogenetics of Diphyllobothrium ditremum (Creplin, 1925) and Ligula intestinalis (Linnaeus, 1758) (Cestoda: Pseudophyllidea). Syst Parasitol 23, 167–173 (1992). https://doi.org/10.1007/BF00010869

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  • DOI: https://doi.org/10.1007/BF00010869

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