Oryctes rhinoceros

Distribution in the Philippines. This species is found throughout the archipelago. Overall distribution. This species is widespread in the Indo-Pacific region and is also found in the Palearctic, Australian, Neotropical, and Madagascan regions (Hao et al. 2022).

Sumber: First in 109 years: Catalogue of scarab beetles (Coleoptera: Scarabaeidae) of the Philippines

Published data: Yadav et al. (1979) and Dasgupta (1977) reported a 20, XYp formula, but no chromosome description. However, we found this karyotype with 18 chromosomes quite original, compared to others. Pairs nos 1 and 2 are sub-metacentric, and all other autosomes are acrocentric (a single euchromatic arm), but look more or less submetacentric by the addition of large and variable heterochromatic fragments on their short arms. A large portion of the sub-metacentric X and acrocentric Y undergo synapsis at the pachytene stage and chiasma at the metaphase I of meiosis (not shown) demonstrating its autosomal origin and that the neo-sex chromosomes derive from an X-Y-autosome translocation. This karyotype, close to that of Oryctes nasicornis Linnaeus, 1758 (Dutrillaux & Dutrillaux 2009 a), only differs from it (neglecting heterochromatin variations) by the inversion of pair no. 8, which is metacentric in O. nasicornis. NOR location: small autosome (no. 6).

Sumber: Chromosome analyses challenge the taxonomic position of Augosoma centaurus Fabricius, 1775 (Coleoptera: Scarabaeidae: Dynastinae) and the separation of Dynastini and Oryctini