01513nas a2200193   4500008004100000022001400041245014200055210006900197260001200266300001200278490000700290520082100297100001401118700002901132700001901161700001501180700001701195856010701212       2007                        eng d  a1519-698400aChromosome polymorphism and complements in populations of Girardia species (Platyhelminthes, Tricladida, Paludicola) from Southern Brazil0 aChromosome polymorphism and complements in populations of Girard  c12/2007  a951-9550 v673 a<p>The karyotypes of four species of freshwater triclads of the genus Girardia (Platyhelminthes), i.e. G. schubarti, G. tigrina, G. anderlani, and G. biapertura, from populations of different localities of the Rio Grande do Sul State, in southern Brazil, were analyzed. The karyotype of G. biapertura is presented for the first time. Three basic complements of 4, 8, and 9 chromosomes were found. Diploids, triploids, or mixoploids (2n/3n) specimens were frequently detected in these populations. The basic chromosomal complement of n = 9 was verified in two different species (G. biapertura and G. anderlani), presenting a large acrocentric chromosome which is rare in the family Dugesiidae. An intra and interspecific chromosomal variability was also detected and its evolutionary implications are discussed.</p>
1 aBenya, E.1 aLeal-Zanchet, Ana, Maria1 aSantos, W., H.1 aHauser, J.1 aErdtmann, B.  uhttp://www.scielo.br/scielo.php?script=sci_abstract&pid=S1519-69842007000500021&lng=en&nrm=iso&tlng=en