Species
Trocholites depressus (Eichwald, 1840)
Synonymy list
1840     Nautilus depressus m. — Eichwald , pp. 125
1840     Nautilus depressus m. — Eichwald , pp. 106, fig. German edition
1859     Calymenia depressa — Eichwald , fig. 50:5a,b
1860     Calymenia depressa m. — Eichwald , pp. 1305
1861     Calymenia depressa — Eichwald , pp. 379, fig. 29:5a,b,c
1881     Paleonautilus depressus — Remele , pp. 13
1890     Paleonautilus depressus — Remele , pp. 37
1891     Trocholites depressus — Schröder , pp. 13, fig. 1:4,7
1926     Trocholites depressus — Patrunky , pp. 125
1953     Trocholites depressus (Eichwald, 1840) — Balashov , pp. 242, fig. VII 2
Selection of related publications
Aubrechtová, M., & Korn, D. 2025. The coiled Middle Ordovician cephalopod genera Trocholites and Curtoceras (Tarphyceratida) from Baltoscandia and north-central Europe.  European Journal of Taxonomy   982,      1-78. DOI:10.5852/ejt.2025.982.2843
Balashov, Z. G. 1953. Svernutye i polusvernutye nautiloidei ordovika Pribaltiki.  Trudy Vsesoûznogo Naučno-Issledovatel'skogo Geologo-Razvedočnogo Instituta (VNIGRI)         217-300.  Gostoptehizdat. 
Eichwald, E. 1861. Paleontologiâ Rossii. Drevnij period. II. Fauna grauvakkovoj, gornoizvestkovoj i medistoslancevatoj formacij Rossii. pp. 1-521.  R. Golike (former Ya. Ionsona). 
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Mollusca | 
| Class | Cephalopoda | 
| Subclass | Tarphyceratia | 
| Order | Tarphyceratida | 
| Family | Trocholitidae | 
| Genus | Trocholites | 
| Species | ammonius | 
| baldri | |
| contractus | |
| damesii | |
| depressus | |
| freyjae | |
| gennadii | |
| glacialis | |
| hospes | |
| incongruus | |
| kadakaensis | |
| luna | |
| macromphalus | |
| odini | |
| orbis | |
| remelei | |
| soraviensis | |
| splendor | |
| triangulus | |
| tureki | |
| vodickai | |
| vortex | |
| zaryensis | 
References based on distribution
- Eichwald, 1861a Osmussaar 1
- Balashov, 1953a Osmussaar 1 Lasnamägi Stage