Pterospermopsis fragalis
- Citations total:
- 3
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| details | Late Llandoverian | New York | Thusu,B. et al. Middle Silurian acritarchs in the Upper type Clinton Group, East-Central New York. | 1974 | |
| details | Wenlockian | New York | Thusu,B. et al. Middle Silurian acritarchs in the Upper type Clinton Group, East-Central New York. | 1974 | |
| details | Wenlockian | Nd | Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. | 1990 |