Summary Chromosomal analyses of the common sun skink (Eutropis multifasciata) from mitotic and meiotic cell divisions were studied. Blood samples were taken from five male and five female skinks. Skink chromosome preparations were conducted by the squash technique from the bone marrow and testis. The chromosomes were stained by conventional staining and Ag-NOR banding techniques. The results showed that the diploid chromosome number of E. multifasciata was 2n=32, the fundamental number (NF) was 48 in both males and females. The types of chromosomes were present as 6 large metacentric, 2 large submetacentric, 6 small metacentric, 2 small submetacentric, 2 small telocentric macrochromosomes and 14 microchromosomes. There was no irregularly sized chromosome related to sex. We also observed distinctive nucleolar organizer regions (NORs) at the region adjacent to the short arms near the telomere of a pair of the largest metacentric chromosomes. We found that during diakinesis (prophase I) the homologous chromosomes showed synapsis, which can be defined as the 16 bivalents and 16 haploid chromosomes at metaphase II as diploid species. The common sun skink (Eutropis multifasciata) belongs to the class Reptilia, order Squamata, suborder Laccertilia, infarorder Scincomorpha, family Scincidae, and subfamily Lygosominae (Fig. 1). The family Scincidae is the largest family of the extant lizards and includes over 1,200 species ranging from temperate to tropical regions on all continents inhabited by reptiles (Matsui 1992, Zug 1993, Pough et al. 2004. Greer (1970) on the basis of external and osteological characters divided this family in to four subfamilies: Acontinae, Feylininae, Scincinae, and Lygosominae.The subfamily Lygosominae contains over 600 species (Greer 1970, Matsui 1992, Zug 1993. Within this subfamily three evolutionary lineages (Eugongylus, Mabuya, and Shenomorphus groups) are recognized on morphological criteria, karyology, and immunogenetics (Baverstock and Donnellan 1990, Donnellan 1991, Ota and Lue 1994, Ota et al. 1991, 1995, 1996.There is a remarkable paucity of karyotypic information available for the family Scincidae. The karyotypes of fewer than 50 of the 1,200 or so species are recorded (Makino and Asana 1950,
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