Species
Ungula triangularis (Mickwitz, 1896)
Synonymy list
1969     Obolus (Obolus) triangularis Mickwitz, 1896 — Gorjansky , pp. 24, fig. 1:21,22
1993     Ungula inornata (Mickwitz, 1896) — Puura & Holmer , pp. 219
2013     Ungula triangularis (Mickwitz, 1896) — Lang & Puura , pp. 123
Selection of related publications
Gorjansky, V. J. 1969. Bezzamkovye brahiopody kembrijskih i ordovikskih otloženij severo-zapada Russkoj platformy. pp. 1-176.  Nedra. 
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Brachiopoda | 
| Subphylum | Linguliformea | 
| Class | Lingulata | 
| Order | Lingulida | 
| Superfamily | Linguloidea | 
| Family | Obolidae | 
| Subfamily | Obolinae | 
| Genus | Ungula | 
| Species | convexa | 
| ingrica | |
| inornata | |
| triangularis | 
References based on distribution
- Gorjansky, 1969 Jägala River Pakerort Stage
- Gorjansky, 1969 Maardu opencast mine Pakerort Stage