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