Cranial allometry and geographic variation in slow lorises (Nycticebus)

American Journal of Primatology
M J Ravosa

Abstract

A series of 20 craniodental measurements was obtained for two sister taxa: Nycticebus coucang (common slow loris) and N. pygmaeus (pygmy slow loris). Multivariate analysis of variance was performed with adult data to describe patterns of subspecific and specific variation in this genus. The geometric mean of adult cranial dimensions was compared to field data on latitudinal coordinates for available specimens to investigate if size variation in Nycticebus is clinal in nature. Ontogenetic series for larger-bodied N. coucang and smaller-bodied N. pygmaeus were compared to test the hypothesis that species and subspecific variation in skull form results from the differential extension of common patterns of relative growth. A MANOVA provides independent support of Groves's [pp. 44-53 in Proceedings of the Third International Congress on Primatology, Vol. 1 (Basel: S. Karger), in 1971)] classification of Nycticebus into two species, with four subspecies in the common slow loris and one form of the pygmy slow loris. Within N. coucang, cranial proportions for all four subspecies are ontogenetically scaled, and size differentiation is mainly clinal (Bergmann's Rule). N. c. bengalensis represents the most northerly disposed and the large...Continue Reading

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Citations

Sep 18, 2012·Journal of Human Evolution·Sarah E FreidlineJean-Jacques Hublin
Jan 23, 2014·American Journal of Physical Anthropology·Tsuyoshi ItoMasanaru Takai
Dec 21, 2012·American Journal of Primatology·Rachel A MundsSusan M Ford
Sep 29, 2011·American Journal of Primatology·Mary E BlairMartha M Hurley
Nov 23, 2010·American Journal of Physical Anthropology·Robin M Bernstein
Nov 19, 2009·American Journal of Primatology·Matthew J Ravosa, Ashley N Daniel
Feb 22, 2001·Journal of Human Evolution·L J ShapiroJ Cooper
Dec 16, 2006·American Journal of Primatology·Matthew J Ravosa
Dec 14, 2005·American Journal of Physical Anthropology·Steven R Leigh
Jan 9, 2019·International Journal for Parasitology. Parasites and Wildlife·Liesbeth FriasAndrew J J MacIntosh

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