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17 June 2021 Ecogeographic variation and taxonomic boundaries in Large Treeshrews (Scandentia, Tupaiidae: Tupaia tana Raffles, 1821) from Southeast Asia
Maya M. Juman, Neal Woodman, Link E. Olson, Eric J. Sargis
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Abstract

The Large Treeshrew, Tupaia tana , is a small mammal (∼205 g) from Southeast Asia with a complicated taxonomic history. Currently, 15 subspecies are recognized from Borneo, Sumatra, and smaller islands, and many were originally differentiated based on minor pelage differences and small sample sizes. We explored intraspecific variation in T. tana using quantitative osteological data obtained from the hands and skulls of museum specimens. Multivariate analyses reveal extensive overlap among T. tana populations in morphospace, indicating that the majority of currently recognized subspecies are not morphometrically distinct. In contrast, the separation between Bornean and Sumatran populations of T. tana is sufficient to recognize them as different subspecies. Comparisons of Bornean specimens to those on small, offshore islands reveal that the latter average smaller body size. This pattern is inconsistent with Foster's island rule, which predicts that island populations of small mammals (< 5 kg) will average larger body size relative to mainland forms. A similar lack of support for ecogeographic rules has been noted in T. glis (), suggesting that these “rules” are poor predictors of geographic variation in treeshrews.

Maya M. Juman, Neal Woodman, Link E. Olson, and Eric J. Sargis "Ecogeographic variation and taxonomic boundaries in Large Treeshrews (Scandentia, Tupaiidae: Tupaia tana Raffles, 1821) from Southeast Asia," Journal of Mammalogy 102(4), 1054-1066, (17 June 2021). https://doi.org/10.1093/jmammal/gyab059
Received: 13 July 2020; Accepted: 24 April 2021; Published: 17 June 2021
KEYWORDS
cranium
hand
island rule
mandible
manus
morphology
skull
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