Chalcosoma atlas, Linnaeus, 1758

Dutrillaux, Anne-Marie, Mamuris, Zissis & Dutrillaux, Bernard, 2013, Chromosome analyses challenge the taxonomic position of Augosoma centaurus Fabricius, 1775 (Coleoptera: Scarabaeidae: Dynastinae) and the separation of Dynastini and Oryctini, Zoosystema 35 (4), pp. 537-549 : 543

Chalcosoma atlas : 20,neoXY ( Fig. 3 B )

Published data: Dutrillaux & Dutrillaux (2012).This karyotype is fairly unusual, because the formation of its large and bi-armed neo sex-chromosomes, probably by a double translocation with autosomes, is not accompanied by a reduced number of autosomes. The size of the large chromosomes (nos 1-3) is roughly similar, instead decreasing in size, which suggests that fragments of the two largest of them contributed to form the neoXY by translocation. Heterochromatin is fairly abundant at all centromeric regions.All chromosomes are meta-/sub-metacentric. NOR location: large autosome (no. 3).

Figures

FIG. 3. – C-banded karyotype of three representatives of Dynastini: A, Allomyrina dichotoma Linné, 1771; B, Chalcosoma atlas Linnaeus, 1758; C, Augosoma centaurus Fabricius, 1775. Notice that most chromosomes of A. centaurus are acrocentric (entirely heterochromatic [dark] short arms) as in O. rhinoceros Linnaeus,1758 (Fig.2) and O.nasicornis Linnaeus,1758 (Dutrillaux & Dutrillaux, 2012). Scale bars: 10 µm.