A new mammaliaform from the Early Jurassic and evolution of mammalian characteristics

IVPP-IR > 中科院古脊椎所（2000年以后）

	A new mammaliaform from the Early Jurassic and evolution of mammalian characteristics
	Luo, ZX ; Crompton, AW ; Sun, AL ; Luo, ZX (reprint author), Carnegie Museum Nat Hist, Sect Vertebrate Paleontol, Pittsburgh, PA 15213 USA.
	2001-05-25
发表期刊	SCIENCE
ISSN	0036-8075
卷号	292 期号:5521 页码:1535-1540
文章类型	Article
摘要	A fossil from the Early Jurassic (Sinemurian, similar to 195 million years ago) represents a new Lineage of mammaliaforms, the extinct groups more closely related to the living mammals than to nonmammaliaform cynodonts. it has an enlarged era nial cavity, but no postdentary trough on the mandible, indicating separation of the middle ear bones from the mandible. This extends the earliest record of these crucial mammalian features by some 45 million years and suggests that separation of the middle ear bones from the mandible and the expanded brain vault could be correlated. It shows that several key mammalian evolutionary innovations in the ear region, the temporomandibular joint, and the brain vault evolved incrementally through mammaliaform evolution and Long before the differentiation of the Living mammal groups. With an estimated body weight of only 2 grams, its coexistence with other Larger mammaliaforms with similar "triconodont-like" teeth for insectivory within the same fauna suggests a great trophic diversity within the mammaliaform insectivore feeding guild, as inferred from the range of body sizes.; A fossil from the Early Jurassic (Sinemurian, similar to 195 million years ago) represents a new Lineage of mammaliaforms, the extinct groups more closely related to the living mammals than to nonmammaliaform cynodonts. it has an enlarged era nial cavity, but no postdentary trough on the mandible, indicating separation of the middle ear bones from the mandible. This extends the earliest record of these crucial mammalian features by some 45 million years and suggests that separation of the middle ear bones from the mandible and the expanded brain vault could be correlated. It shows that several key mammalian evolutionary innovations in the ear region, the temporomandibular joint, and the brain vault evolved incrementally through mammaliaform evolution and Long before the differentiation of the Living mammal groups. With an estimated body weight of only 2 grams, its coexistence with other Larger mammaliaforms with similar "triconodont-like" teeth for insectivory within the same fauna suggests a great trophic diversity within the mammaliaform insectivore feeding guild, as inferred from the range of body sizes.
WOS标题词	Science & Technology
URL	查看原文
关键词[WOS]	MORGANUCODON ; DIVERSITY ; ECOLOGY ; SKULL
收录类别	SCI
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000168963800042
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/3867
专题	中科院古脊椎所（2000年以后）
通讯作者	Luo, ZX (reprint author), Carnegie Museum Nat Hist, Sect Vertebrate Paleontol, Pittsburgh, PA 15213 USA.
作者单位	1.Carnegie Museum Nat Hist, Sect Vertebrate Paleontol, Pittsburgh, PA 15213 USA 2.Harvard Univ, Museum Comparat Zool, Cambridge, MA 02138 USA 3.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China
推荐引用方式 GB/T 7714	Luo, ZX,Crompton, AW,Sun, AL,et al. A new mammaliaform from the Early Jurassic and evolution of mammalian characteristics[J]. SCIENCE,2001,292(5521):1535-1540.
APA	Luo, ZX,Crompton, AW,Sun, AL,&Luo, ZX .(2001).A new mammaliaform from the Early Jurassic and evolution of mammalian characteristics.SCIENCE,292(5521),1535-1540.
MLA	Luo, ZX,et al."A new mammaliaform from the Early Jurassic and evolution of mammalian characteristics".SCIENCE 292.5521(2001):1535-1540.

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