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首页> 外文期刊>Journal of the Geological Society of India >On Vertebraria Royle from Triassic of Nidpur, Madhya Pradesh
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On Vertebraria Royle from Triassic of Nidpur, Madhya Pradesh

机译：中央邦，尼德普尔三叠纪的Vertebraria Royle

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摘要

The present paper embodies a description of a new species of the vertebrarian axis Vertebraria Royle (1834) from the Triassic Nidpur beds, M.P., India. Structurally preserved axes of the new species Vertebraria nidpurensis occur as horizontal or longitudinal compressions exhibiting excellent features of secondary xylem tissue. The description is based on a single hand specimen, displaying four axes lying in different positions but all exposed in their lateral views. Total length of axes is unknown but the largest specimen is about 7.2 cm long. Width of axes ranges between 0.2 cm–2.8 cm depending on the number of vertical series of elongated rectangular areas present in the axis. Each vertical file of rectangles is separated from adjacent series by a narrow longitudinal groove. The rectangular area of longitudinal file is separated from the rectangle above and below by a thick or thin transverse bar that extends from one longitudinal groove to the other. Three axes out of four exhibit well preserved secondary tissues that showed features which were quite different from species of Vertebraria reported upto date. The new species differs from all other previously described structurally preserved species in having tracheids that bear pits on both tangential and radial walls and in having wood rays that are 2–35 celled high. Vertebrarian axes of above type are being reported for the first time from Triassic of Nidpur, Madhya Pradesh.
机译：本文体现了对来自印度M.P.的Triassic Nidpur床的椎骨轴Vertebraria Royle（1834）的新种的描述。新物种Vertebraria nidpurensis的结构保存轴以水平或纵向压缩的形式出现，表现出次生木质部组织的优良特性。该描述基于单个手样本，显示了四个位于不同位置但均在其侧视图中暴露的轴。轴的总长度未知，但最大的标本大约为7.2 cm长。轴的宽度范围在0.2厘米至2.8厘米之间，具体取决于轴中存在的细长矩形区域的垂直系列的数量。每个矩形的垂直文件都由一个狭窄的纵向凹槽与相邻的序列分开。纵向锉刀的矩形区域通过一根从一条纵向凹槽延伸到另一条纵向凹槽的粗细横杆与上方和下方的矩形分隔开。四分之三的轴显示保存完好的次生组织，其次生组织特征与迄今为止报道的椎骨种类完全不同。新物种与先前描述的所有其他结构保存物种不同，其气管在切向和径向壁上都带有凹坑，并且木射线的细胞高2-35。中央邦尼德普尔的三叠纪首次报道了上述类型的椎骨轴。

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