Functional Anatomy of Incisal Biting in Aplodontia rufa and Sciuromorph Rodents - Part 1: Masticatory Muscles, Skull Shape and Digging
Functional Anatomy of Incisal Biting in Aplodontia rufa and Sciuromorph Rodents - Part 1: Masticatory Muscles, Skull Shape and Digging
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DOI：
10.1159/000284931
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发表时间：
2010-01-01
影响因子：
2.7
通讯作者：
Druzinsky, Robert E.
中科院分区：
文献类型：
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作者：
Druzinsky, Robert E.
传统上，啮齿类动物被分为亚目，主要根据颌内收肌的特征和咀嚼器的其他特征来区分。三个经典的亚目是：松鼠亚目（松鼠）、鼠形亚目（大鼠和小鼠）和豪猪亚目（豪猪和南美洲的豚鼠形啮齿动物）。原型啮齿动物被认为代表了啮齿动物咀嚼肌的原始状态。山海狸是唯一现存的原形啮齿动物。本工作对中国人的咀嚼器进行了详细的比较研究。rufa和旱獭，土拨鼠。而A. rufa看起来很特别，不像其他啮齿动物。是A. rufa是原始的，protroomorphous条件的合理代表？A. rufa是aplodontoid-sciuroid分支的成员，具有宽而平的头骨。A. rufa是与其相对较宽的头骨有关的特征。这些特征在其他松鼠形动物中表现得不那么明显，A. rufa类似于在sciuromorfs中看到的排列。版权所有（C）2010 S. Karger AG，巴塞尔
Traditionally, rodents have been grouped into suborders distinguished largely on the basis of characteristics of the jaw adductor muscles and other features of the masticatory apparatus. The three classic suborders are: Sciuromorpha (squirrels), Myomorpha (rats and mice), and Hystricomorpha (porcupines and the South American caviomorph rodents). Protrogomorph rodents are thought to represent the primitive condition of rodent masticatory muscles. Aplodontia rufa, the mountain beaver, is the only living protrogomorphous rodent. The present work is a detailed comparison of the masticatory apparatus in A. rufa and Marmota monax, the woodchuck. But the mandibular region of A. rufa appears remarkable, unlike anything found in other rodents. Is A. rufa a reasonable representative of the primitive, protrogomorphous condition? A. rufa is a member of the aplodontoid-sciuroid clade with a wide and flat skull. The large temporalis and mandibular apophyses of A. rufa are features related to its relatively wide skull. Such features are found in less dramatic forms in other sciuromorphous species and the basic arrangement of the masticatory muscles of A. rufa is similar to the arrangement seen in sciuromorphs. Copyright (C) 2010 S. Karger AG, Basel