“…have 2n=16 while Microcycas shows 2n=26 (Table 1). However, Zamia with 41 species studied shows a dysploid range from 2n=16-28 while Z. chigua (2n=22, 24, 25, 26;Norstog 1980Norstog , 1981 Moretti & Sabato 1984, Moretti 1990, Tagashira & Kondo 1999, 2001, Vovides & Olivares 1996Napalitano et al 2004), Z. prasina (2n=22, 26;Moretti et al 1993) and Z. variegata (2n=21, 22;Moretti et al 1991Moretti et al , 1993 show extensive intraspecific variation (Table 1). All this variability in chromosome numbers without any change in the number of chromosome arms is however, explained by centric fissions as there exists a ratio of one-to-two between median and terminal chromosomes with increase or decrease of somatic number (Olson & Gorelick 2011.…”