Mesodictyon , A New Fossil Genus of the Centric Diatom Family Thalassiosiraceae from the Miocene Chalk Hills Formation, Western Snake River Plain, Idaho
Mesodictyon , A New Fossil Genus of the Centric Diatom Family Thalassiosiraceae from the Miocene Chalk Hills Formation, Western Snake River Plain, Idaho
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Mesodictyon，来自爱达荷州西蛇河平原中新世白垩山组的中心硅藻科海藻科的新化石属
DOI：
10.2307/1485573
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发表时间：
1987
影响因子：
1.5
通讯作者：
J. Bradbury
中科院分区：
文献类型：
--
作者：
E. Theriot;J. Bradbury
描述了爱达荷州中新世湖相沉积中三个新的中心硅藻种。新属的种，Mesodictyon，在室的中间有乳晕，突起和辐射状的非束状纹。M. magnum（直径60-150臂）的支撑过程具有长（2-3 Am）管状延伸。fovis的突起（直径14- 80，m）在接近地表和地幔交界处的明显凹坑中。波状蕨的瓣面（直径10-44朗姆）呈弱切向波状。初步证据表明，中第三纪具有广泛的地理分布，可能是一个有用的生物地层标志。
Three new centric diatom species assigned to a new genus are described from Miocene lacustrine deposits of Idaho. Species of the new genus, Mesodictyon, have the areola cribrum in the middle of the loculus, strutted processes and radiating, non-fasciculated striae. The strutted processes of M. magnum (diameter 60-150 Arm) have long (2-3 Am) tubular extensions. The strutted processes of M. fovis (diameter 14-80 ,m) are in distinct pits near the junction of the face and mantle. The valve face of M. undulatum (diameter 10-44 rum) is weakly tangentially undulate. Preliminary evidence indicates that Mesodictyon has a wide geographic distribution and may be a useful biostratigraphic marker.