VALVE DEVELOPMENT IN AULACODISCUS
VALVE DEVELOPMENT IN AULACODISCUS
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Aulacodiscus 的阀门开发
DOI：
10.1080/0269249x.2008.9705746
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发表时间：
2008
期刊：
影响因子：
1.8
通讯作者：
M. Tiffany
中科院分区：
文献类型：
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作者：
M. Tiffany
利用光镜和扫描电子显微镜对采集于美国加利福尼亚、佛罗里达、澳大利亚和非洲沿海生境的一些现存耳盘科植物进行了研究。关于本属阀门发育顺序的信息是由未成熟标本的结构推断出来的。管子从阀门边缘均匀间隔的开口向外生长，在同一位置上，二氧化硅的内部襟翼形成弯曲的狭缝。黄花月牙和黄花月牙发育模式相似，管内结构复杂。A. africanus和A. kittonii是另一种自然类群，其外部管开口呈裂隙状。argus与化石种A. rogersii和A. grevilleanus相似；它们都在凹陷处有非常小的室簇，周围有宽脊和大疱，可以推测它们是以类似的方式形成的。在奥勒冈和阿格斯中，气泡状小球茎的形成紧随其后。早期阀中可见的一些特征被后来的二氧化硅沉积所掩盖。
A number of extant Aulacodiscus species collected in marine coastal habitats in California, Florida, Australia and Africa were examined with light and scanning electron microscopy. Information on the sequence of development in valves of this genus was inferred by the structures seen in immature specimens. Tubes grow outwardly from evenly spaced openings at the margins of the valve in the same position where internal flaps of silica initiate curved slits. Aulacodiscus scaber and A. petersii are similar in pattern of development and both have complex internal structures within their tubes. A. africanus and A. kittonii are another natural group with slitted external tube openings. A. argus is similar to the fossil species A. rogersii and A. grevilleanus; all have clusters of very small loculi in depressions with surrounding broad ridges and bullulae and can be presumed to have formed in like manner. The formation of the bubble-like bullulae was followed in A. oregonus and A. argus. Some features, visible in early valves, are obscured by later silica deposition.