Species
Torquigraptus involutus (Lapworth, 1876)
Synonymy list
1876     Monograptus intermedius var. involutus — Lapworth , pp. 316, fig. 10:11
1913     Monograptus involutus (Lapworth) — Elles et Wood , pp. 478, fig. 49:4a-c
1945     Monograptus involutus — Waterlot , pp. 86, fig. 41:414
1946     Spirograptus involutus — Přibyl , pp. 20, fig. 7:1-5
1962     Oktavites involutus  — Haletskaya , pp. 83, fig. 6:8
1965     Oktavites involutus (Lapworth), 1876 — Obut et al. , pp. 81-82, fig. 14:4
2003     Torquigraptus involutus (Lapworth, 1876) — Williams et al. , pp. 33, fig. 3H-J
2003     Torquigraptus involutus (Lapworth) — Loydell et al. , pp. 211
2009     Torquigraptus involutus (Lapworth, 1876) — Štorch & Kraft , fig. fig. 11A
Selection of related publications
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
Ulst, R. Ž., Gailite, L. K., Springis, T. K. 1984. Lithostratigraphic subdivision of the subsurface Ordovician rocks of the Jelgeva Depression.  Stratigrafiâ drevnepaleozojskih otloženij Pribaltiki, pp. 63-76.   Eesti NSV Teaduste Akadeemia. 
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Hemichordata | 
| Class | Pterobranchia | 
| Subclass | Graptolithina | 
| Order | Graptoloidea | 
| Suborder | Axonophora | 
| Family | Monograptidae | 
| Genus | Torquigraptus | 
| Species | arcuatus | 
| australis | |
| conspectus | |
| decipiens | |
| denticulatus | |
| flagellaris | |
| involutus | |
| loveridgei | |
| planus | |
| pragensis | |
| proteus | |
| tullbergi | |
| valens | 
References based on distribution
- Ulst et al., 1984 Paroveja 9 borehole Llandovery
- Loydell et al., 2003 Aizpute 41 borehole 969.08 - 969.08 Aeronian