Box-and-whisker plot of relative lengths of chromosomes of different species of the L. distinguendus complex (based on data of the chromosome measurements also used in Table 2). The means, medians, second and third quartiles as well as variation ranges of RLs are represented by X signs, horizontal lines within boxes, boxes and whiskers respectively. 1, 4 etc. – numbers of chromosomes of the species with n = 5; 2’, 3’ etc. – numbers of chromosomes of the species with n = 6.