Species
Cyrtograptus rigidus Tullberg, 1883
Synonymy list
1883     Cyrtograptus rigidus — Tullberg , pp. 38, fig. 4:12-14
1900     Cyrtograptus symmetricus — Elles , pp. 410, fig. 24:4A-B
1914     Cyrtograptus symmetricus Elles — Elles and Wood , pp. 509, fig. 51:5a-c
1923     Cyrtograptus rigidus Tullberg — Gortani , pp. 59, fig. 11:5-11; 13:4D, 6A
1933     Cyrtograptus rigidus Tullberg — Bouček , pp. 41, fig. 8c-d; 5:7-8
1945     C. symmetricus Elles — Waterlot , pp. 94, fig. 49:474
1952     Cyrtograptus rigidus Tullb. — Münch , pp. 36, 136, fig. 51:1a-d
1967     Cyrtograptus rigidus cautleyensis — Rickards , pp. 246, fig. 13d
1975     Cyrtograptus rigidus Tullberg — Berry et Murphy , pp. 89-90, fig. 13:3
1980     Cyrtograptus rigidus Tullberg, 1883 — Lenz , pp. 1084, fig. 2:H-I
Selection of related publications
Loydell, D. K., Nestor, V., Männik, P. 2010. Integrated biostratigraphy of the lower Silurian of the Kolka-54 core, Latvia.  Geological Magazine   147,   2,   253-280. DOI:10.1017/S0016756809990574
Paškevičius, J. 1979. Biostratigraphy and Graptolites of the Lithuanian Silurian. pp. 1-267.  Mokslas. 
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Hemichordata | 
| Class | Pterobranchia | 
| Subclass | Graptolithina | 
| Order | Graptoloidea | 
| Family | Cyrtograptidae | 
| Genus | Cyrtograptus | 
| Species | bohemicus | 
| carruthersi | |
| centrifugus | |
| egregius | |
| ellesae | |
| hamatus | |
| hemmanni | |
| lapworthi | |
| linnarssoni | |
| lundgreni | |
| metatheca | |
| murchisoni | |
| perneri | |
| radians | |
| rigidus | |
| symmetricus | |
| trilleri | 
References based on distribution
- Loydell et al., 2010 Kolka 54 borehole 519.8 - 519.85 Jaagarahu Stage
 - Paškevičius, 1979 Wenlock