Phylogenetic relationships among extant classes of echinoderms, as inferred from sequences of 18S rDNA, coincide with relationships deduced from the fossil record
Phylogenetic relationships among extant classes of echinoderms, as inferred from sequences of 18S rDNA, coincide with relationships deduced from the fossil record
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根据 18S rDNA 序列推断，现有棘皮动物类别之间的系统发育关系与根据化石记录推断的关系一致
DOI：
10.1007/bf00175494
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发表时间：
2004
影响因子：
3.9
通讯作者：
N. Satoh
中科院分区：
文献类型：
--
作者：
H. Wada;N. Satoh
尽管有丰富的化石记录和多种形态学和胚胎学特征的描述，棘皮动物的起源和随后的进化仍然是非常有争议的问题。利用18S rDNA的序列数据，我们已经调查了现存的五类棘皮动物，即海百合，小行星，蛇类，海胆，和海参类之间的系统发育关系。几乎完整的18S rDNA序列，确定为一个物种在每个类，和系统发育树构建的邻居加入方法和最大似然法，与半索动物作为外群。这些方法构建的进化树支持了棘皮动物门可分为两个亚门的假设，即Pelmatozoa和Eleutherozoa。海参总科（Holothuroidea）是争论的主题，关于其成员是原始的还是先进的棘皮动物，并没有占据原始的位置，但与Echinoidea有亲缘关系。由于这两个树给出了不同的分支拓扑结构的出现顺序的小行星和蛇尾，这似乎是可能的，这两个群体出现在一个非常短的时间内。根据目前的分子分析，对这五个类的分歧时间的粗略估计与从化石记录中推断的一致。
In spite of the rich fossil record and multiple descriptions of morphological and embryological characteristics, the origin and subsequent evolution of echinoderms remain highly controversial issues. Using sequence data derived from 18S rDNA, we have investigated the phylogenetic relationships among five extant classes of echinoderms—namely, crinoids, asteroids, ophiuroids, echinoids, and holothurians. Almost complete sequences of 18S rDNA were determined for one species in each class, and phylogenetic trees were constructed both by the neighbor joining method and by the maximum-likelihood method, with a hemichordate as an outgroup. The trees constructed by these methods support the hypothesis that the phylum Echinodermata can be subdivided into two subphyla, Pelmatozoa and Eleutherozoa. The class Holothuroidea, which has been the subject of debate with respect to whether the members are primitive or advanced echinoderms, did not occupy a primitive position but had an affinity for the class Echinoidea. Since both trees gave different branching topologies for the order of emergence of asteroids and ophiuroids, it seems likely that these two groups emerged within a very short period of time. A rough estimate of the timing of the divergence of the five classes from the present molecular analysis coincided with that deduced from the fossil record.
影响因子：
56.9
作者：
FIELD, KG;OLSEN, GJ;RAFF, RA
通讯作者：
RAFF, RA
海胆直接发育进化的约束、灵活性和系统发育史。
影响因子：
2.7
作者：
Raff,RA
通讯作者：
Raff,RA