Genus
Opsiconidion Ludvigsen, 1974
Aiheeseen liittyvät julkaisut
Popov L., Nõlvak J., Holmer, L. 1994. Late Ordovician lingulate brachiopods from Estonia.  Palaeontology   37,   3,   627-650.
Biernat, G. 1984. Silurian inarticulate brachiopods from Poland.  Acta Palaeontologica Polonica   29,   1-2,   91-103.
Popov, L. 1981. The first record of microscopoic inarticulate brachiopods of the family Acrotretidae of the Silurian of Estonia.  Eesti NSV Teaduste Akadeemia Toimetised. Geoloogia / Известия Академии наук Эстонской ССР. Геология   30,   1,   34-41. DOI:10.3176/geol.1981.1.06
List of species
2. Opsiconidion podlasiensis Biernat, 1984 | Wenlock
3. Opsiconidion praecursor Popov, Nõlvak et Holmer, 1994 | Pirgu Stage
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Luokittelu
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Brachiopoda | 
| Subphylum | Linguliformea | 
| Class | Lingulata | 
| Order | Acrotretida | 
| Superfamily | Acrotretoidea | 
| Family | Biernatidae | 
| Genus | Biernatia | 
| Opsiconidion | |
| Species | aldridgei | 
| podlasiensis | |
| praecursor |