Species
Petalolithus folium (Hisinger, 1837)
Synonymy list
1837     Prionotus folium — Hisinger , pp. 114, fig. 35:8
1881     Diplograptus folium — Törnquist , pp. 442, fig. 17:7
1882     Cephlograptus folium — Tullberg , pp. 15, fig. 1:15-19
1897     Cephalograptus folium Hisinger — Perner , pp. 12, fig. 10:14
1911     Petalograptus  folium (Hisinger) — Elles & Wood , pp. 282, fig. 32:8a-e; text fig. 195
1919     Diplograptus (Petalograptus) folium — Kirste , pp. 128, fig. 1:29a-b
1952     Petalograptus (Petalolithus) folium — Münch , pp. 64, fig. 7:5a-b
1967     Petalograptus aff. foilum (Hisinger), 1837 — Obut & Sobolevskaya , pp. 67
1975     Petalograptus  foilum (Hisinger, 1837) — Bjerreskov , pp. 35, fig. 12c
1979     Petalograptus folium (Hisinger, 1837) — Paškevičius  , pp. 135-136, fig. 5:10; 21:13
Selection of related publications
Maletz, J., Ahlberg, P., Suyarkova, A., Loydell, D. K. 2014. Silurian graptolite biostratigraphy of the Röstånga-1 drill core, Scania – a standard for southern Scandinavia.  GFF   136,   1,   175-178. DOI:10.1080/11035897.2013.865665
Loydell, D. K., Männik, P., Nestor, V. 2003. Integrated biostratigraphy of the lower Silurian of the Aizpute-41 core, Latvia.  Geological Magazine   140,   2,   205-229. DOI:10.1017/S0016756802007264
Paškevičius, J. 1979. Biostratigraphy and Graptolites of the Lithuanian Silurian. pp. 1-267.  Mokslas. 
Gailite, L. K., Rybnikova, M. V., Ulst, R. Ž. 1967. Stratigrafiâ, fauna i usloviâ obrazovaniâ silurijskih porod Srednej Pribaltiki. pp. 1-304.  Zinatne. 
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Hemichordata | 
| Class | Pterobranchia | 
| Subclass | Graptolithina | 
| Order | Graptoloidea | 
| Suborder | Axonophora | 
| Superfamily | Retiolitoidea | 
| Family | Retiolitidae | 
| Subfamily | Petalolithinae | 
| Genus | Petalolithus | 
| Species | dubovikovi | 
| folium | |
| intermedius | |
| minor | |
| ovatoelongatus | |
| praecedens | |
| praecursor | 
References based on distribution
- Loydell et al., 2003 Aizpute 41 borehole 971.72 - Aeronian
- Gailite et al., 1967 Inčukalns borehole Llandovery
- Maletz et al., 2014 Röstanga 1 borehole 35.3 - 35.4 Aeronian
- Paškevičius, 1979 Kunkojai 12 borehole 1376.8 - Llandovery