八臂仙母虫(Eoandromeda octobrachiata)新材料及其意义

被引：4

作者：

唐烽 ^{[1
,2
]}

Stefan Bengtson ^{[3
]}

尹崇玉 ^{[1
,2
]}

高林志 ^{[1
,2
]}

机构：

[1] 中国地质科学院地质研究所

[2] 中国地质科学院地层学与古生物学重点实验室

[3] Department of Palaeozoology,Swedish Museum of Natural

来源：

地球学报 | 2011年 / 32卷 / 06期

关键词：

陡山沱组; 八臂仙母虫; 伊迪卡拉生物群; 栉水母类; 后生动物起源;

D O I：

暂无

中图分类号：

Q915.2 [化石];

学科分类号：

摘要：

在中国贵州江口地区陡山沱组新发现的化石材料表明,伊迪卡拉/震旦纪(Ediacaran/Sinian)的宏体化石——八臂仙母虫Eoandromeda octobrachiata的原始生活状态可能为一个较高的圆锥形生命体,具有沿着侧面锥状螺旋排列的八条旋臂。旋臂表面保存有与栉水母动物的栉板可能同源的横向有机质条带,规则排列的旋臂可能与栉板带同源,具有右旋八辐射对称的特征;但是缺乏诸如触手、平衡石、极区构造和两辐射对称等的冠群栉水母类的典型性状,由此,Eoandromeda被解释归属为一类早期的干群栉水母动物。若干精美化石还保存了明显的中央环带,与八条栉板带状的旋臂相联接,和中寒武世栉水母化石的反口面圆环极为相似,推测与神经系统和运动摄食能力的发育有关,表明它有可能具备在近海或远洋浮游掠食的生活方式。在伊迪卡拉/震旦纪早期陡山沱组化石记录中出现八辐射的栉水母类化石,与后生动物种系发生的Planulozoa假设(栉水母动物Ctenophora是刺胞动物Cnidaria+两侧对称动物Bilateria的姐妹群)最为一致。

引用

页码：641 / 651

页数：11

共 11 条

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