On the karyology ofDugesia gonocephalas.l. (Turbellaria, Tricladida) from Montpellier, France
✍ Scribed by Elizabeth J. Vries
- Book ID
- 104622084
- Publisher
- Springer
- Year
- 1986
- Tongue
- English
- Weight
- 888 KB
- Volume
- 132
- Category
- Article
- ISSN
- 1573-5141
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✦ Synopsis
Two species belonging to the Dugesia gonocephala group are found in the area of Montpellier, France . The karyology of these two species, D. gonocephala s . str. and S. subtentaculata, and of fissiparous Dugesia races has been studied .
Two populations belonging to D. gonocephala s . str. are diploids with a chromosome number of 16, whereas the specimens of a third population are sexual aneuploids ; the majority of cells possess 24 chromosomes, but some cells contain 23 or 25 . The specimens attributable to D. subtentaculata are triploids, the most notable karyological feature being the presence of a single unmatched acrocentric chromosome . The fissiparous Dugesia strains are all aneuploids, the most common chromosome number being 27 with up to three small B-chromosomes.