Clitoral length in immature and mature captive tufted capuchin (Sapajus spp.) females: A cross-sectional study.,American Journal of Primatology

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Clitoral length in immature and mature captive tufted capuchin (Sapajus spp.) females: A cross-sectional study.
American Journal of Primatology ( IF 2.0 ) Pub Date : 2020-04-22 , DOI: 10.1002/ajp.23135
Monica Carosi _{1,

2} , Federica Spani ₂ , Amy E Ulland ₁ , Massimiliano Scalici ₂ , Stephen J Suomi ₁

Affiliation

Quantitative data on female external genital morphology are sporadic in the primate literature, and the intraspecific and interfemale variation is especially under investigated (e.g., external clitoris length). Since in most anthropoid primate species female external genitals are relatively small and often hidden, for those species whose external clitoris is described as hypertrophic, external genital resemblance may represent a source of confusion in distinguishing the sexes at a distance. This is the case of both captive and wild tufted capuchin (Sapajus spp.) infants. We provided data on external clitoral length and investigated differences in this trait at different ages in a captive female tufted capuchin population. Since likely allometric growth describes changes in relative dimensions of parts of the body that are correlated with changes in overall size, clitoris length has been analyzed by using body weight as a covariate. We measured clitoral length by adapting a technique developed for spotted hyenas (Crocuta crocuta). Our results suggest that the small body size may be only in part responsible of the perception of long clitoris in female infants, since the clitoris is actually longer in immature females compared to adult ones and its size is inversely related to body weight. While the cross‐sectional nature of these data does not allow for conclusive interpretation of the results, we tentatively suggest this phenomenon as a transient male‐mimicry by immature females. Our study contributed to the description of normative data in a clitoral trait, thus providing foundation for future studies about causal mechanisms and possible adaptive function(s).

中文翻译：

未成熟和成熟圈养丛生卷尾猴（Sapajus spp.）雌性的阴蒂长度：横断面研究。

关于女性外生殖器形态的定量数据在灵长类动物文献中是零星的，特别是在研究种内和雌性间的变异（例如，外阴蒂长度）。由于在大多数类人猿灵长类物种中，雌性外生殖器相对较小且经常隐藏，对于那些外阴蒂被描述为肥大的物种，外生殖器相似性可能是在远处区分性别时混淆的根源。这是圈养和野生簇绒卷尾猴（Sapajusspp.) 婴儿。我们提供了关于外部阴蒂长度的数据，并调查了圈养雌性簇绒卷尾猴种群在不同年龄的这一特征的差异。由于可能的异速生长描述了与整体尺寸变化相关的身体部位相对尺寸的变化，因此已通过使用体重作为协变量来分析阴蒂长度。我们通过采用一种为斑点鬣狗（Crocuta crocuta ）开发的技术来测量阴蒂长度）。我们的研究结果表明，较小的体型可能只是对女婴长阴蒂感知的部分原因，因为与成年女性相比，未成熟女性的阴蒂实际上更长，并且其大小与体重成反比。虽然这些数据的横截面性质不允许对结果做出决定性的解释，但我们暂时认为这种现象是未成熟女性对男性的短暂模仿。我们的研究有助于描述阴蒂特征中的规范数据，从而为未来关于因果机制和可能的适应功能的研究奠定基础。

更新日期：2020-04-22

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