Sciuromorpha
Also known as Sciuromorph, Sciuromorphs
Sciuromorpha ( 'squirrel-like') is a rodent suborder that includes several rodent families. It includes all members of the Sciuridae (the squirrel family) as well as the mountain beaver species.
Species
松鼠形亚目（学名：Sciuromorpha，）又譯松鼠亞目，是啮齿目以下的亞目，當中包括有松鼠、花栗鼠、山河狸及很多種類的嚙齒動物。這個亞目下的動物的特徵就是下顎的獨特形狀，其下顎的活動是與門齒的牙根同一平面。這與豪豬亞目的下顎活動完全不同，豪豬亞目的下顎活動是離開門齒牙根的平面，因在下顎中有著一個與肌肉連接的窩。 参见 鼠形亚目 河狸亚目 鳞尾松鼠亚目 豪猪亚目 维基共享资源中相关的多媒体资源：松鼠形亚目 维基物种中的分类信息：松鼠形亚目 这是一篇與哺乳动物相關的小作品。你可以通过编辑或修订扩充其内容。 查 论 编 取自“https://zh.wikipedia.org/w/index.php?title=松鼠形亚目&oldid=53118130” 分类：松鼠形亞目 隐藏分类： 物种微格式条目 含有拉丁語的條目 缺少Wikidata链接的维基共享资源分类 全部小作品 哺乳類小作品
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Sciuromorpha ( 'squirrel-like') is a rodent suborder that includes several rodent families. It includes all members of the Sciuridae (the squirrel family) as well as the mountain beaver species.
Traditionally, the term has been defined on the basis of the shape of the infraorbital canal. A sciuromorphous zygomasseteric system is characterized by attachment of the lateral masseter muscle along the side of the rostrum. Unlike hystricomorphous and myomorphous rodents, the medial masseter muscle does not pass through the infraorbital canal. Among extant rodents, only the families Sciuridae, Castoridae, Heteromyidae, and Geomyidae are truly sciuromorphous. Some authorities would exclude the Geomyidae and Heteromyidae from that list due to the attachment of the medial masseter directly behind the zygomatic arch.