MORPHOLOGICAL VARIATION IN THE EBONY AND SILVER LEAF MONKEYS [TRACHYPITHECUS AURATUS (E. GEOFFROY, 1812) AND TRACHYPITHECUS CRlSTATUS (RAFFLES, 1821)] FROM SOUTHEAST ASIA

IBNU MARYANTO (Research and Development Centre for Biology, LIPI. Jl. Ir.H. Juanda 18 Bogor,)
I. MANSJOER (Primate Research Centre- Bogor Agricultural University,)
D. SAJUTHI (Primate Research Centre- Bogor Agricultural University)
J. SUPRlATNA (Center for Biodiversity and Conservation Studies, University of Indonesia, Depok 16424,)

TREUBIA
Vol 31, No 2 (1997): Vol. 31 No. 2, December 1997

The morphological variation in the ebony and silver leaf monkeys (Trachypithecus auratus and T. cristatus) from Southeast Asia; Thailand, Malaya, Bintan, Sumatra, Serasan-Natuna, Kalimantan and Java were studied using multivariate analysis approaches. The results showed that clinal variation in skull; dental and dentary morphology was found in Java. The skull; dental and dentary characters showed an increase from West to East with Central Java as an intermediate fonn. Consequently, in Java there should be only one subspecies, T. a. auratus. Meanwhile, there are fourmorpholgical groups of Trachipithecus cristatus, those are of Thailand, Malaya-Sumatra-Kalimantan, Bintan and Natuna. The Malayan population, presumably is the same as Bintan population while Sumatra-Kalimantan forms an intermediate.