Family
Sigmoopsidae Henningsmoen, 1953
Selection of related publications
Sarv, L. 1959. Ordovician ostracodes in the Estonian S.S.R.. ENSV TA Geoloogia Instituudi uurimused IV, 1-210.
List of species
1. Reigiopsis oepiki Sarv, 1959 | Kunda Stage
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Classification
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Arthropoda |
| Subphylum | Crustacea |
| Class | Ostracoda |
| Order | Beyrichicopida |
| Suborder | Palaeocopa |
| Superfamily | Hollinacea |
| Family | Ctenoloculinidae |
| Euprimitiidae | |
| Hollinidae | |
| Sarvinidae | |
| Sigmoopsidae | |
| Genus | Reigiopsis |
| Family | Tetradellidae |
| Tvaerenellidae | |
| Genus | Diceratobolbina |