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根据浙赣三山地区完好保存的Ｐｓｅｕｄｉｓｏｇｒａｐｔｕｓ笔石体胎管和胞管纺锤层（增生层）的立体标本，参照现生翼鳃类杆壁虫和头盘虫类的生长速率，推算此类笔石的最小平均生命期。同时扼要介绍笔石个体古生态学及与之有关的原理和方法
Based on the three-dimensional specimens of Pseudisograptus penolithic and tubular spindle (hyperplasia) well preserved in the Sanshan area of Zhejiang, Jiangxi Provinces, and referring to the growth rates of the presently occurring Pilothorax and the first panicle worms, The minimum average life span. At the same time, a brief introduction to the individual ecology of penoliths and its related principles and methods