Species
Ungula ingrica (Eichwald, 1829)
Synonymy list
1829     Obolus ingricus n. sp. — Eichwald , pp. 274
1829     Obolus ingricus n. — Eichwald , pp. 274
1840     Obolus ingricus m. — Eichwald , pp. 192-194
1840     Obolus ingricus m. — Eichwald , pp. 165-167
1849     Obolus ingricus m. — Eichwald , pp. 165
1856     Obolus ingricus — Eichwald , pp. 453
1857     Obolus ingricus — Eichwald , pp. 120
1860     Obolus ingricus m. — Eichwald , pp. 926
1861     Obolus ingricus — Eichwald , pp. 264
1896     Obolus Apollinis var. ingricus — Mickwitz , pp. 137, fig. 1:15-28
Selection of related publications
Lang, L., Kirsimäe, K., Vahur, S. 2016. Diagenetic fate of bioapatite in linguliform brachiopods: multiple apatite phases in shells of Cambrian lingulate brachiopod Ungula ingrica  (Eichwald).  Lethaia   49,   1,   13-27.  Wiley.  DOI:10.1111/let.12127
Lang, L., Puura, I. 2013. Phosphatized organic nanostructures in the Cambrian linguloid brachiopod Ungula inornata (Mickwitz).  Estonian Journal of Earth Sciences   62,   3,   121-130. DOI:10.3176/earth.2013.10
Puura, I. 1996. Lingulate brachiopods and biostratigraphy of the Cambrian-Ordovician boundary beds in Baltoscandia.  Doctoral Thesis, pp. 1-214.   Uppsala University. 
Holmer, H., Popov, L. E. 1990. The acrotretacean brachiopod Ceratreta tanneri (Metzger) from the Upper Cambrian of Baltoscandia.  GFF   112,   3,   249-263. DOI:10.1080/11035899009454772
Kaljo, D., Borovko, N., Heinsalu, H., Khazanovich, K., Mens, K., Popov, L., Sergejeva, S., Sobolevskaya, R., Viira, V. 1986. The Cambrian-Ordovician boundary in the Baltic-Ladoga clint area (North Estonia and Leningrad Region, USSR).  Eesti NSV Teaduste Akadeemia Toimetised. Geoloogia / Известия Академии наук Эстонской ССР. Геология   35,   3,   97-108. DOI:10.3176/geol.1986.3.01
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
- Holmer & Popov, 1990 [Duplicate record of 13389] Borehole No M-77 Upper Cambrian (old nomenclature)
- Gorjansky, 1969 Maardu opencast mine Pakerort Stage
- Gorjansky, 1969 Jägala River Pakerort Stage
- Gorjansky, 1969 Iru outcrop Pakerort Stage