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1979年7月间许继伯同志和笔者赴湖北竹溪一带进行化石采集工作,曾在杨家山、梅子垭等地采获不少笔石化石,特别在梅子垭水库旁约200米处的下志留统陡山沟组底部采到的一些笔石标本,经笔者鉴定是塔形螺旋笔石带(Spirograptus turriculatus zone)内的一种新笔石,取名筒形螺旋笔石(Spirograptus cylindricus sp. nov.)。筒形螺旋笔石(新种),特征明显,标志性强,与Spirograptus turriculatus共生。S.turriculatus是华中区下志留统龙马溪组上部的标准带化石。因此,新种的描述,对补充塔形螺旋笔石标准带化石的新材料具有一定的地层意义,对探讨它们之间的演化关系也提供了一定的线索。
In July 1979, Comrade Xu Jibo and the author went to Hubei Zhu Xi area for fossil collection, once in Yangjiashan, Mei Ziyu and other places to collect a lot of pen petrified fossils, especially in Mei Ziyu reservoir about 200 meters below the next stay A number of pen specimens collected from the bottom of the Doushan Sag have been identified by the author as a new penolith in the Spirograptus turriculatus zone named Spirograptus cylindricus sp. Nov. ). Cylindrical spiral penolith (new species), characterized by obvious, strong symbol, and Spirograptus turriculatus symbiosis. S. tricriculatus is the fossil standard belt in the upper part of the Lower Silurian Longmaxi Formation in Central China. Therefore, the description of the new species has some stratigraphic significance for replenishing the standard fossil-bearing materials of pyramidal pyrochlore, and provides some clues to explore the evolutionary relationship between them.