Species
Ptychodictyon ancestralis Valiukevičius, 1986
Synonymy list
1986     Ptychodictyon ancestralis Valiukevičius, sp. nov. — Valiukevičius & Karatajūtė-Talimaa , pp. 114, fig. II 5-7, 
1998     Ptychodictyon ancestralis Valiukevičius — Valiukevičius , pp. 7
Selection of related publications
Valiukevičius, J., Karatajūtė-Talimaa, V. 1986. Kompleks češuj akantodov iz osnovaniâ srednego devona Pribaltiki i Belorussii.  Biofacies and fauna of the Silurian and Devonian basins of the Baltic, pp. 110-122.   Zinatne. 
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Classification
| Organism group | Biota | 
| Incertae sedis (fossils) | |
| Order | Diplacanthiformes | 
| Family | Diplacanthidae | 
| Genus | Ptychodictyon | 
| Species | ancestralis | 
| distinctum | |
| rimosum | |
| sulcatum | 
References based on distribution
- Valiukevičius & Karatajūtė-Talimaa, 1986 Mehikoorma 421 borehole 242.6 - 244.1 Rezekne Stage