Karyological Studies on Land Planarians (Tricladida, Terricola)

摘要

The karyotypes of two land planarians from Madeira have been determined from mitotic metaphase plates from blastema tissue.Kontikia bulbosa(Geoplanidae) possesses a diploid complement of six pairs of chromosomes, all metacentric, and all rather small, that is less than 3 #x3bc;im in mean length.Microplana terrestrisshows mixoploid hyperdiploidy the presumed eudiploid complement comprising three pairs of elements, the largest, ca. 5 (#x3bc;m, metacentric and the two smaller ones submetacentric. The mosaics exhibit various types of trisomic, tetrasomic and pentasomic aneuploidy. The significance of this variation is not known.