Species
Ungula convexa Pander, 1830
Synonymy list
1830     Ungula plana sp. nov. — Pander , pp. 59, fig. 28:3,5
1890     Ungula convexa sp. nov. — Pander , pp. 59, fig. 28:1,2
1989     Ungula convexa Pander, 1830 — Popov & Khazanovitch , pp. 117, fig. Pl. 6:3-13, 15-17; 7:1-11
2002     Obolus apollinis Eichwald, 1829 — Emig , pp. 5
2003     Ungula convexa Pander, 1830 — Popov & Holmer , fig. 3A; 4D-F; 6A-C
2013     Ungula convexa Pander, 1830 — Lang & Puura , pp. 23
Selection of related publications
Nemliher, J., Kurvits, T., Kallaste, T., Puura, I. 2004. Apatite varieties in the shell of the Cambrian lingulate brachiopod Obolus apollinis Eichwald.  Proceedings of the Estonian Academy of Sciences. Geology   53,   4,   246-256. DOI:10.3176/geol.2004.4.02
Puura, I. 1996. Lingulate brachiopods and biostratigraphy of the Cambrian-Ordovician boundary beds in Baltoscandia.  Doctoral Thesis, pp. 1-214.   Uppsala University. 
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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
- Nemliher et al., 2004a Lava River, Leningrad Oblast