Dirks Wendy
Department of Anthropology, Division of History and Social Science, Oxford College of Emory University, Oxford, Georgia 30054, USA.
Am J Primatol. 2003 Sep;61(1):29-40. doi: 10.1002/ajp.10106.
In this study, dental development is described in two pairs of closely related catarrhine primate species that differ in their degree of folivory: 1) Hylobates lar and Symphalangus syndactylus, and 2) Papio hamadryas hamadryas and Semnopithecus entellus. Growth increments in histological thin sections are used to reconstruct the chronology of dental development to determine how dental development is accelerated in the more folivorous species of each pair. Although anterior tooth formation appears to be unrelated to diet, both S. syndactylus and S. entellus initiate the slowest-forming molar earlier than the related less-folivorous species, which supports the hypothesis that dental acceleration is related to food processing. S. syndactylus initiates M2 crown formation at an earlier age than H. lar, and S. entellus initiates and completes M3 at an earlier age than P. h. hamadryas. Similar stages of M3 eruption occur earlier in the more folivorous species; however, the sex of the individual may also play a role in creating such differences. Although the age at M3 emergence is close to that reported for the end of body mass growth in lar gibbons, hamadryas baboons, and Hanuman langurs, M3 emergence may not be coupled to body mass growth in siamangs.
在本研究中，我们描述了两对密切相关的狭鼻类灵长目物种的牙齿发育情况，这两对物种在食叶程度上存在差异：1）白掌长臂猿（Hylobates lar）和合趾猿（Symphalangus syndactylus），以及2）阿拉伯狒狒（Papio hamadryas hamadryas）和长尾叶猴（Semnopithecus entellus）。利用组织学薄片中的生长增量来重建牙齿发育的时间顺序，以确定每对中食叶性更强的物种的牙齿发育是如何加速的。尽管前牙的形成似乎与饮食无关，但合趾猿和长尾叶猴都比相关的食叶性较弱的物种更早开始形成最慢的臼齿，这支持了牙齿加速与食物加工有关的假设。合趾猿比白掌长臂猿更早开始形成M2牙冠，长尾叶猴比阿拉伯狒狒更早开始并完成M3的形成。M3萌出的相似阶段在食叶性更强的物种中出现得更早；然而，个体的性别也可能在造成这种差异中发挥作用。尽管M3萌出的年龄与白掌长臂猿、阿拉伯狒狒和长尾叶猴体重增长结束时报告的年龄相近，但合趾猿的M3萌出可能与体重增长无关。
