Figure 3From: Alike but different: the evolution of the Tubifex tubifex species complex (Annelida, Clitellata) through polyploidizationKaryotype reconstruction on metaphase chromosomes of T. blanchardi and of the T. tubifex lineages of the Lambro River. A. The diploid T. blanchardi (2n = 50), consisting of 42 meta- and submetacentric chromosomes and 8 acrocentric chromosomes; B. the triploid Tubifex (lineage 2a, 3n = 75) composed of 64 meta submetacentric chromosomes and 11 acrocentric chromosomes; C. the tetraploid Tubifex (lineage 2b, 4n = 100) composed of 87 meta-, submetacentric chromosomes and 13 acrocentric chromosomes, with one large metacentric chromosome marker (arrowhead); D. the hexaploid Tubifex (lineage 2c, 6n = 150), composed of 128 meta- submetacentric chromosomes and 22 acrocentric chromosomes, with two large metacentric chromosome markers (arrowheads); E. the tetraploid Tubifex (lineages 3a, 2n = 100) composed of 74 meta- or submetacentric and 26 acrocentric chromosomes, with four large metacentric chromosome markers (arrowheads); F. the tetraploid Tubifex (lineages 3b, 2n = 100) composed of 69 meta- or submetacentric chromosomes and 31 acrocentric chromosomes, with four large metacentric chromosome markers (arrowheads). Numbers indicate the meta- or submetacentric chromosomes; underlined numbers indicate acrocentric chromosomes. Scale bars are 4 μm in A, 3 μm in B, 2.5 μm in D and 2 μm in C, E, and F.Back to article page