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Mitotic chromosomes of Micwsomacanthus spp. (A) Developing embryo with dividing cells. (B) Mitotic metaphase and karyotype of M. spasskii. (C) Mitotic metaphase and karyotype of M. spiralibursata. Scales are
Source publication
Analysis of Giemsa-stained mitotic metaphase plates of Microsomacanthus
spasskii and M. spiralibursata (Cestoda: Hymenolepididae) revealed the diploid
chromosome numbers for both species to be 2n=6. The karyotypes are remarkably
similar in general morphology; they both consist of three pairs of metacentric or
meta-submetacentric chromosomes graded...
Contexts in source publication
Context 1
... divisions were mainly observed in developing embryos (preoncospheral stage) ( fig. 1A), which have proved fairly good for cytogenetical studies. The recent setting up of a cellular suspension technique has improved the research, providing well-spread, monolayer chromoso- mal plates which show higher resolution than squash preparations. Mean karyometrical data are reported in table 1. The chromosomes of 86 mitotic metaphases of M. spasskii were counted. All cells had 2n=6 (fig. IB). The karyotype is composed of three pairs of metacentric homol- ogues. Pair 1 is somewhat larger and could be easily distinguished from the remaining elements. The mean total length of the haploid complement is 17.33 ...
Context 2
... karyotype of M. spiralibursata is very similar to that of the previous species (fig. 1C). Chromosome counts were performed from 49 metaphase plates; 47 cells showed 2n=6, 2 cells had a tetraploid number of 4n=12. The haploid genome has a mean total length of 15.37 /jm. The only significant karyometric difference (P < 0.05) was noted in the values of the centromeric indexes of the chromosome pair 3, which are slightly more heterobranchial than that of M. spasskii, and have an intermediate meta-submetacentric type of structure (c.i. = ...
Context 3
... divisions were mainly observed in developing embryos (preoncospheral stage) ( fig. 1A), which have proved fairly good for cytogenetical studies. The recent setting up of a cellular suspension technique has improved the research, providing well-spread, monolayer chromoso- mal plates which show higher resolution than squash preparations. Mean karyometrical data are reported in table 1. The chromosomes of 86 mitotic metaphases of M. spasskii were counted. All cells had 2n=6 (fig. IB). The karyotype is composed of three pairs of metacentric homol- ogues. Pair 1 is somewhat larger and could be easily distinguished from the remaining elements. The mean total length of the haploid complement is 17.33 ...
Context 4
... karyotype of M. spiralibursata is very similar to that of the previous species (fig. 1C). Chromosome counts were performed from 49 metaphase plates; 47 cells showed 2n=6, 2 cells had a tetraploid number of 4n=12. The haploid genome has a mean total length of 15.37 /jm. The only significant karyometric difference (P < 0.05) was noted in the values of the centromeric indexes of the chromosome pair 3, which are slightly more heterobranchial than that of M. spasskii, and have an intermediate meta-submetacentric type of structure (c.i. = ...
