Species
Boreadorthis crassa Öpik, 1934
Type specimen data
holotype: TUG TUG 1068-212, Moe stratotype outcrop (Estonia, Moe) , Pirgu Stage (Pirgu Stage; Katian) 
Synonymy list
1900     Orthis sadewitzensis sp. nov. — Wysogorski , pp. 231, fig. 8
1934     Boreadorthis crassa sp. nov. — Öpik , pp. 186, fig. 9: 3; text-figs 42(II), 43, 45, 46(upper fig.)
1953     Boreadorthis crassa Öpik, 1934 — Alichova , pp. 41, fig. 3: 11-15
1959     Boreadorthis crassa Öpik — Oraspõld , pp. 65, 66, fig. 3:; 3-5
1976     Boreadorthis crassa Öpik — Tsegelnjuk , pp. 28-29, fig. pl. 4: 1; text-fig. 3: 8-15
Selection of related publications
Oraspõld, A. L. 1959. Some representatives of the Superfamily Orthacea from the Upper Ordovician of Estonia.  Tartu Riikliku Ülikooli Toimetised   75,   I,   51-79.
Öpik, A. 1934. Über Klitamboniten.  Acta et Commentationes Universitatis Tartuensis   XXVI,   5,   1-239.  K. Mattiesen. 
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Brachiopoda | 
| Subphylum | Rhynchonelliformea | 
| Class | Rhynchonellata | 
| Order | Orthida | 
| Suborder | Orthidina | 
| Superfamily | Orthoidea | 
| Family | Hesperorthidae | 
| Genus | Boreadorthis | 
| Species | crassa | 
| recula | |
| sadewitzensis | 
References based on distribution
- Öpik, 1934c [Duplicate record of 10027] Moe quarry Pirgu Stage