权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

CLADISTIC CLASSIFICATION OF CELLEPORID BRYOZOANS USING LARVAL AND METAMORPHIC CHARACTERS.

使用幼虫和变态特征对细胞苔藓虫进行分类。

基本信息

批准号：
63540593
负责人：
MAWATARI Shunsuke F.
金额：
$ 1.15万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

项目摘要

Character analysis for the morphology of celleporids larvae distinguished six taxonomically important characters as follows: 1)corona, 2)pallial epithelium, 3)oral epithelium, 4)metasomal sac, 5)pyriform organ, and 6)messenchyme. Among them, three stable characters, pallial and oral epithelium and metasomal sac, were examined in the seven species of celleporids from Hokkaido. The polarity of the three characters transformed among the celleporids revealed that Pseudocelleporina was derived from the species of Celleporina. Among the species in Celleporina, however, the transformation series of the three characters did not coincide with each other. An out-group comparison was then applied to determine which character reflected a true phylogeny of the celleporids. Since the closest relative of celleporids has not been specified, three genera, Cellepora, Galeopsis, and Lagenipora were tentatively chosen as the out-groups. Three cladograms obtained did not agree with each other. In the present study, I was not able to get any answer to the question which cladogram involved a true phylogram, because there was no data to show which one of the three genera was the out-group of celleporids. As a result, present study anyhow accomplished the character analysis of celleporid larvae, but resulted neither cladograms nor phylograms of the species from Hokkaido. For cladistic systematics of a taxon without any appropriate out-group, a method other than the out-group comparison is needed to determine the polarity of a transformation series of characters.

通过形态学特征分析，确定了6个在分类学上具有重要意义的特征：1）冠部，2）套膜上皮，3）口部上皮，4）后生囊，5）梨形器，6）间充质。其中，三个稳定的特征，外盖和口腔上皮和交代囊，检查了七种celleporids从北海道。3个性状在胞菌群间的极性转换表明，假胞菌属是由胞菌属的种演化而来的。但在Celleporina中，这三个性状的转化序列并不一致。然后进行组外比较，以确定哪个特征反映了celleporids的真实遗传。由于没有指定的最近的亲戚celleporids，三个属，Cellepora，Galeopsis，和Lagenipora暂定为外群。得到的3个分支图彼此不一致。在目前的研究中，我无法得到任何答案的问题，哪一个分支图涉及一个真正的分支图，因为没有数据表明这三个属中的哪一个是celleporids的外群。结果表明，本研究完成了该属幼虫的特征分析，但没有得到该属北海道种的分支图和聚类图。对于一个没有适当外群的分类单元的分支系统学，需要一种不同于外群比较的方法来确定性状转换序列的极性。