Genus
Signetopsis Henningsmoen, 1954
Selection of related publications
Hansch, W. 1991. Die silurischen Geschiebe-Ostrakoden von Krause, Steusloff und Kummerow.  Archiv für Geschiebekunde   1,   2,   79-104.
Abushik, A. F., Ivanova, V. A., Kochetkova, N. M., Martynova, G. L., Neckaja, A. I., Rozdestvenskaya, A. A. 1960. Novye paleozojskie ostrakody Russkoj i Sibirskoj platform, Urala i Pečorskoj grâdy.  New species of prehistoric plants and invertebrates of the USSR. Vol. II, pp. 280-367.   Gosgeoltehizdat. 
List of species
3. Signetopsis rotundata (Krause, 1891) | Wenlock
4. Signetopsis semicircularis (Krause, 1891) | Rootsiküla Stage
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Arthropoda | 
| Subphylum | Crustacea | 
| Superclass | Oligostraca | 
| Class | Ostracoda | 
| Subclass | Podocopa | 
| Order | Palaeocopida | 
| Suborder | Beyrichicopina | 
| Palaeocopa | |
| Superfamily | Primitiopsacea | 
| Family | Primitiopsididae | 
| Subfamily | Primitiopsinae | 
| Genus | Clavofabella | 
| Macuwemuna | |
| Orcofabella | |
| Primitiopsella | |
| Primitiopsis | |
| Signetopsis | |
| Species | malornata | 
| quadrilobata | |
| rotundata | |
| semicircularis | |
| Genus | Undulirete |