Species
Gorbyoceras clathratoannulatum (Roemer, 1861)
Synonymy list
1858     Orthoceras anellum — Schmidt , pp. 197
1861     Orthoceras clathro-annulatum  — Roemer , pp. 57-58, fig. 7:4
1891     Orthoceras clathro-annulatum  — Schmidt , pp. 38
1929     Orthoceras clathro-annulatum  — Sauramo , pp. 8,10
1930     Spyroceras clathro-annulatum  — Teichert , pp. 279, fig. Taf. 5, Fig. 5.
2025     Gorbyoceras clathratoannulatum (Roemer, 1861) comb. nov. — Kröger , pp. 40, fig. Figs 11B–C, 12C, H, 18
Selection of related publications
Kröger, B. 2025. The Lyckholm acme of cephalopods – Review of the late Katian (Vormsi–Pirgu regional stages) Ordovician cephalopods of Estonia.  European Journal of Taxonomy   978,      1-169. DOI:10.5852/ejt.2025.978.2801
Teichert, C. 1930. Die Cephalopoden-Fauna der Lyckholm-Stufe des Ostbaltikums.  Paläontologische Zeitschrift   12,   3/4,   264-312. DOI:10.1007/BF03044452
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Mollusca | 
| Class | Cephalopoda | 
| Subclass | Orthoceratia | 
| Order | Orthocerida | 
| Suborder | Orthoceratina | 
| Family | Proteoceratidae | 
| Genus | Gorbyoceras | 
| Species | alternestriatum | 
| clathratoannulatum | |
| stumburi | |
| textumaraneum | 
References based on distribution
- Teichert, 1930c Piirsalu old quarry
- Teichert, 1930c Saare Manor (Lyckholm) old quarry
- Teichert, 1930c Haapsalu
- Teichert, 1930c Saxby