Acoel flatworms:: Earliest extant bilaterian metazoans, not members of Platyhelminthes
Acoel flatworms:: Earliest extant bilaterian metazoans, not members of Platyhelminthes
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DOI：
10.1126/science.283.5409.1919
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发表时间：
1999-03-19
期刊：
影响因子：
56.9
通讯作者：
Baguñà, J
中科院分区：
文献类型：
--
作者：
Ruiz-Trillo, I;Riutort, M;Baguñà, J
由于其简单的组织，Acoela一直被认为是原始的两侧动物或腔肠动物的后代，通过二次丧失衍生功能。非快速进化物种的acoels和其他后生动物的18S核糖体DNA基因的序列数据显示，这组不属于扁形动物，但代表现存的最早的分歧Bilateria的成员，解释是支持最近的研究胚胎卵裂模式和神经系统的acoels。这项研究对理解主要身体计划的演变，以及对寒武纪进化爆炸的看法有影响。
Because of their simple organization the Acoela have been considered to be either primitive bilaterians or descendants of coelomates through secondary loss of derived features. Sequence data of 18S ribosomal DNA genes from non-fast evolving species of acoels and other metazoans reveal that this group does not belong to the Platyhelminthes but represents the extant members of the earliest divergent Bilateria, an interpretation that is supported by recent studies on the embryonic cleavage pattern and nervous system of acoels. This study has implications for understanding the evolution of major body plans, and for perceptions of the Cambrian evolutionary explosion.