Biogeographical variation on craniomandibular morphology in pallas’s squirrel \(\textit{Callosciurus erythraeus}\) (Pallas, 1779) (Rodentia: Sciuridae) in Vietnam


  • Vu Thuy Duong Institute of Ecology and Biological Resources, VAST, Vietnam
  • Nguyen Truong Son Institute of Ecology and Biological Resources, VAST, Vietnam
  • Bui Tuan Hai Graduate University of Science and Technology, VAST, Vietnam
  • Ly Ngoc Tu Institute of Ecology and Biological Resources, VAST, Vietnam
  • Dang Huy Phuong Institute of Ecology and Biological Resources, VAST, Vietnam
  • Tran Anh Tuan Institute of Ecology and Biological Resources, VAST, Vietnam
  • Masaharu Motokawa The Kyoto University Museum, Kyoto University, Japan
  • Hideki Endo The University Museum, The University of Tokyo, Japan
  • Tatsuo Oshida Laboratory of Wildlife Biology, Obihiro University of Agriculture and Veterinary Medicine



Indochina Peninsula, mandible, skull, vegetation


Different forest vegetations provide herbivorous small mammals with different resources, forcing adaptation since food habits depend on available resources. We expect differences in vegetation to be reflected in the size and shape of the skull and mandible as a result of potentially different feeding resources. Therefore, we analyzed the craniomandibular characteristics of Pallas’s squirrel (Callosciurus erythraeus) in Vietnam. This species commonly occurs in different vegetations in Vietnam, making it a good model for examining morphological adaptation to vegetation type. We analyzed morphologically the skulls and mandibles of 156 specimens collected from 31 localities in Vietnam from 1960 to the present. Principal component analysis showed that females occurring in the tropical lowland evergreen rain forest were clearly separated from those in other vegetations.


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How to Cite

Duong, V. T. ., Son, N. T. ., Hai, B. T. ., Tu, L. N. ., Phuong, D. H. ., Tuan, T. A. ., Motokawa, M., Endo, H., & Oshida, T. (2021). Biogeographical variation on craniomandibular morphology in pallas’s squirrel \(\textit{Callosciurus erythraeus}\) (Pallas, 1779) (Rodentia: Sciuridae) in Vietnam. Academia Journal of Biology, 43(4), 25–44.




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