MICROFOSSILS FROM THE LOWER DEVONIAN RHYNIE CHERT WITH SUGGESTED AFFINITIES TO THE PERONOSPOROMYCETES
MICROFOSSILS FROM THE LOWER DEVONIAN RHYNIE CHERT WITH SUGGESTED AFFINITIES TO THE PERONOSPOROMYCETES
复制标题
DOI：
10.1666/11-087.1
复制
发表时间：
2012-03-01
影响因子：
1.4
通讯作者：
Harper, Carla J.
中科院分区：
文献类型：
--
作者：
Krings, Michael;Taylor, Thomas N.;Harper, Carla J.
Frankbaronia polyspora n.一般的;一般的sp.，出现在植物凋落物中，并作为苏格兰阿伯丁郡下泥盆统Rhynie燧石的微生物垫的居民。标本呈细长圆柱形、椭圆形或球形，薄壁，可能具有圆锥形或柱状表面突起。大多数标本孤立出现，有些是成对或短链排列。每个标本都包含几个小球，每个小球又有一个（亚）中心不透明内含物。不成熟的标本表明，在这个化石的个体发育包括形成一个单一的中心机构的不透明的材料，随后被分配在发展中的小球体。多孢Frankbaronia polyspora在大小和形态上与在某些现存的霜霉纲成员中看到的含有卵孢子的卵原细胞非常相似。Rhynie燧石已知含有最古老的Peronosporomycetes化石证据，但以前只有一种形式（Hassiella monospora）被记录。这组生物的第二个假定代表的发现证明了这个古生态系统仍然是微生物生命古多样性新信息的重要来源。
A conspicuous silicified microfossil, Frankbaronia polyspora n. gen. n. sp., occurs in plant litter and as an inhabitant of microbial mats from the Lower Devonian Rhynie chert, Aberdeenshire, Scotland. Specimens are elongate-cylindrical, oval, or spherical, thin-walled, and may possess conical or column-like surface projections. Most specimens occur isolated, some are arranged in pairs or short chains. Each specimen contains several small spheres, each in turn with a (sub)centric opaque inclusion. Immature specimens indicate that ontogenesis in this fossil includes the formation of a single centric body of opaque material that subsequently is apportioned among the developing small spheres. Frankbaronia polyspora is quite similar in size and morphology to the oogonia containing oospores seen in certain extant members of the Peronosporomycetes. The Rhynie chert is known to contain the oldest fossil evidence of the Peronosporomycetes but only a single form (Hassiella monospora) has previously been documented. The discovery of a second putative representative of this group of organisms proves that this paleoecosystem is still an important source of new information on the paleodiversity of microbial life.