| Author Title Journal |
Egger B, Ishida S (2005) Chromosome fission or duplication in Macrostomum lignano (Macrostomorpha, Plathelminthes) - remarks on chromosome numbers in 'archoophoran turbellarians'. Journal of Zoological Systematics and Evolutionary Research Vol 43(2): 127-132 [doi: 10.1111/j.1439-0469.2005.00300.x goto] |
Abstract / Notes
"Mitotic metaphase plates of a new species of the genus Macrostomum were studied using conventional Giemsa staining, Orcein staining and semithin sections stained after Richardson. Because of the ease in culturing it, this species has the potential to become the new model organism for developmental and evolutionary studies among the lower metazoa. The chromosome number was found to be 2n _ 8. Reaching a relative length of 45.9_ of the haploid genome size, the chromosomes of one pair were significantly larger than all other chromosomes. Of the smaller pairs, chromosomes of one pair were slightly larger (relative length of 21.3_) than the chromosomes of the remaining two pairs (each with a relative length of 16.4_). All chromosomes were metacentric (2m 2m 2m 2m). For the first time, a diploid chromosome set of four pairs was described for the genus, as compared with previous studies showing predominantly 2n _ 6 for 20 different Macrostomum species."
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