Species
Isorthoceras saaremense (Balashov, 1959)
Synonymy list
1959     Hedstroemoceras saaremense Balaschow, sp. nov. — Balashov , pp. 42, fig. V:11
2025     Isorthoceras saaremense (Balashov, 1959) comb. nov. — Kröger , pp. 49, fig. Figs 15D, 19D, G
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
Balashov, E. A. 1959. Nekotorye  novye vidy nautiloidej ordovika, silura i devona SSSR.  Materialy k "Osnovam paleontologii", Bypusk 3, pp. 37-46.   Paleontologicheskii Institut Akademii Nauk SSSR. 
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Mollusca | 
| Class | Cephalopoda | 
| Subclass | Orthoceratia | 
| Order | Orthocerida | 
| Suborder | Orthoceratina | 
| Family | Proteoceratidae | 
| Genus | Isorthoceras | 
| Species | angelini | 
| bisignatum | |
| cavi | |
| curvilineatum | |
| dalecarlense | |
| elongatocinctum | |
| heroyense | |
| junceum | |
| luhai | |
| maris | |
| nikwis | |
| padisense | |
| saaremense | |
| sociale | |
| suave | |
| sylphide | |
| urdr | |
| vexilli | |
| wahlenbergi | 
References based on distribution
- Balashov, 1959 Tapa
- Kröger, 2025 Kersleti quarry Vormsi Stage
- Kröger, 2025 Paluküla quarry Vormsi Stage
- Kröger, 2025 Salutaguse quarry Pirgu Stage