丝笔石
正笔石目的一属。两个纤细的笔石枝从胎管中部伸出与胎管构成十字形，枝常弯曲，有时弯成S形。在主枝的腹侧又生出若干次枝，次枝间的距离近等。胞管长管状，作波浪状弯曲。晚奥陶世早期，亚洲、欧洲、大洋洲及北美。中国产于南方及甘肃上奥陶统底部。
Classification(s)
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Geographic semantic resource library Earth System(in Chinese) Paleontology
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| English |
|---|
| Name | Nemagraptus |
| Chinese |
|---|
| Name | 丝笔石 |
| Description | 正笔石目的一属。两个纤细的笔石枝从胎管中部伸出与胎管构成十字形，枝常弯曲，有时弯成S形。在主枝的腹侧又生出若干次枝，次枝间的距离近等。胞管长管状，作波浪状弯曲。晚奥陶世早期，亚洲、欧洲、大洋洲及北美。中国产于南方及甘肃上奥陶统底部。 |
{{htmlJSON.HowtoCite}}
NNU_Group (2011). 丝笔石, Concept & Semantic, OpenGMS,
https://geomodeling.njnu.edu.cn/repository/concept/0909535a-5af4-4b36-9585-f859255134d2
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