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Cranial morphology of the golden monkey (Rhinopithecus) and douc langur (Pygathrix nemaeus)

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Human Evolution

Abstract

Because they have been less studied than most other non-human primates (partly due to the difficulties in accessing their habitat) the origins and phylogenetic relationships ofR. roxellana andR. bieti are controversial. These controversies may be clarified to some degree by adding information on the cranium. To this end, ten cranial dimensions analysed morphometrically here provide data about cranial differences among species of the genusRhinopithecus, and between species ofRhinopithecus andPygathrix nemaeus. Though more similar to each other than to any others in the same genus, the results show a significant separation betweenR. roxellana andR. bieti to the degree that they may be regarded as two different species. This confirms the conclusions of prior studies of external features, qualitative morphological characteristics and biochemical evidence (Yeet al, 1987; Zhang and Ryder, 1995; Jablonski, 1998; Penget al., 1988). The differences between these two species are mainly size-related, being highly correlated with cranial length. Other differences, probably non-size related shape differences, however, are highly correlated with cranial width. Sexual dimorphism plays a part in these findings. In relation to the other species, however, the results show that the Vietnam golden monkey (R. avunculus) has closer craniometric relationships with the douc langur (Pygathrix nemaeus) rather than with the three Chinese golden monkey species. Of these, the Gouzhou species (R. brelichi) shares more similarity withR. avunculus and is more separate fromRhinopithecus roxellana and R. bieti. The smaller differentiation between the two latter species could be due to their more recent separation following the dramatic elevation of Qinghai-Tibetan Plateau after the Middle Pleistocene.

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Authors and Affiliations

  1. Department of Anatomy and Human Biology, The University of Western Australia, Nedlands, 6907, Perth, Western Australia, Australia

    Pan R. & Oxnard C.

  2. Department of Systematic Zoology, Kunming Institute of Zoology, The Chinese Academy of Sciences, 650223, Kunming, Yunnan, The People’s Republic of China

    Pan R.

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Pan, R., Oxnard, C. Cranial morphology of the golden monkey (Rhinopithecus) and douc langur (Pygathrix nemaeus). Hum. Evol. 16, 199–223 (2001). https://doi.org/10.1007/BF02437412

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