The karyotype of four Trichinella species
Karyological studies ofTrichinella spiralis, T. pseudospiralis, T. nativa andT. nelsoni were undertaken. Comparison of the karyotypes of theseTrichinella species showed that the chromosome number of all four species is 2n=6 for female specimens and 2n=5 for males. The differences found in the relative chromosome lengths of the individualTrichinella species are not significant.
Centromeric index data indicate thatT. nativa andT. spiralis have similar centromere dispositions and differ from the other two species by the disposition of the centromere of the first submetacentric chromosome pair. InT. nativa andT. nelsoni the univalent sex chromosome is the second in size. It is a slightly submetacentric chromosome, while inT. spiralis andT. pseudospiralis it is the third metacentric chromosome. The data from the karyological investigations may be used as additional karyosystematic characteristics when differentiating theTrichinella species studied.
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