Species
Apatorthis ultima Öpik, 1933
Type specimen data
holotype: TUG TUG 1074-14, Sutlepa quarry (western Estonia, Sutlepa) , Pirgu Stage (Pirgu Stage; Katian) 
Synonymy list
1933     Apatorthis ultima n. sp — Öpik , pp. 11, fig. 1 1a-e
Selection of related publications
Öpik, A. 1933. Über einige Dalmanellacea aus Estland.  Tartu Ülikooli Geoloogia Instituudi Toimetused   32,      1-25.
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Brachiopoda | 
| Subphylum | Rhynchonelliformea | 
| Class | Rhynchonellata | 
| Order | Orthida | 
| Suborder | Dalmanellidina | 
| Superfamily | Dalmanelloidea | 
| Family | Angusticardiniidae | 
| Genus | Apatorthis | 
| Species | inflata | 
| jugata | |
| punctata | |
| tenuicosta | |
| ultima | 
References based on distribution
- Öpik, 1933b Sutlepa quarry Pirgu Stage