Anatomy of the Hand and Arm in Daubentonia madagascariensis :A Functional and Phylogenetic Outlook
Anatomy of the Hand and Arm in Daubentonia madagascariensis :A Functional and Phylogenetic Outlook
复制标题
马达加斯加道本托尼亚手和手臂的解剖：功能和系统发育展望
作者：
C. Soligo
指猴（Daubenonia madagascariensis）无疑是现存灵长类动物中最神秘的。它拥有衍生角色的独特组合，包括不断生长的门牙、功能性的爪子、灵长类动物中最大的手和经过高度改造的中指。专门的中指不再用于运动，而是用作类似探针的工具，用于调查、定位和提取食木（钻木）幼虫以及其他食物。它的指骨可以高速移动并且彼此独立。本研究报告了对两只马达加斯加蜥蜴和狐猴卡塔和鹿猴各一个标本的前肢的解剖。 Daubentonia前肢肌肉组织的衍生特征是在其独特的运动和觅食适应的背景下解释的。 Daubentonia 手部第三指的速度和活动性的主要适应性存在于手部固有肌肉组织中，特别是背侧腱膜的排列中。 Implications for the interpretation of suggested convergences between the aye-aye, the diprotodont marsupial Dactylopsila palpator and the early Tertiary apatemyid genus Heterohyus are discussed.
The aye-aye (Daubentonia madagascariensis) is easily the most enigmatic of living primates. It sports a unique combination of derived characters, including continuously growing incisors, functional claws, the largest hand of any primate and a highly modified middle finger. The specialised middle finger is no longer used in locomotion and serves as a probe-like instrument for investigating, locating and extracting xylophagous (wood-boring) larvae as well as other food items. Its phalanges can be moved both at great speed and independently of each other. The present study reports on dissections of the forelimbs of two individuals of D. madagascariensis and one specimen each of Lemur catta and Cercopithecus cephus. Derived characters of the forelimb musculature in Daubentonia are interpreted within the context of its distinct locomotor and foraging adaptations. The primary adaptations underlying speed and mobility in the third manual digit of Daubentonia are found in the intrinsic hand musculature and notably in the arrangement of the dorsal aponeurosis. Implications for the interpretation of suggested convergences between the aye-aye, the diprotodont marsupial Dactylopsila palpator and the early Tertiary apatemyid genus Heterohyus are discussed.