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乳齿象
释义
乳齿象
Encyclopedia
理学
哺乳纲(化石)
释
mastodont
乳齿象
狭义的作为一个属名,现在被认为是玛姆象属(Mammut)的同物异名,在分类学上已被弃置不用,仅作为美洲乳齿象(Mammut americanum)的通称。而广义的曾经被作为一个超科分类单元,包括了从晚渐新世到更新世的多种象类。随着系统演化理论和支序分系方法的兴起,乳齿象这一并系的类群逐渐被拆解,最终不再成为正式的分类单元。从现在的分类角度,广义的乳齿象类包括现在的古乳齿象类、玛姆象类、嵌齿象类,以及剑齿象类和真象类的最原始的成员。
随便看
family of isogonal trajectories
Family of Man
family of mappings
family of matrices
family of nonclosed orbit
family of operators
family of origin
family of orthogonal trajectories
family of parameters
family of planes
family of points
family of polynomials
family of population distributions
Family of Revolutionaries
family of sets
family of several parameters
family of solutions
family of straight lines
family of supports
family of surfaces
family of Thimig
Family Opera Troupe
Family Opera Troupe of Ming and Qing Dynasty
family-orientation
family parameter
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