Species
Signetopsis semicircularis (Krause, 1891)
Synonymy list
1891     Bollia semicircularis n. sp. — Krause , pp. 497, fig. 31:8-9
1934     Bollia semicircularis Krause — Bassler & Kellett , pp. 219
1954     Signetopsis semicircularis (Krause, 1891) — Henningsmoen , pp. 63-64, fig. 7:10-15
1968     Signetopsis semicircularis (Krause) — Sarv , pp. 88, 92
1991     Signetopsis semicircularis (Krause, 1891) — Hansch , pp. 86, fig. 2:5
2000     Signetopsis semicircularis (Krause, 1891) — Schallreuter , pp. 20-21, fig. 8B:1
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 | Signetopsis | 
| Species | malornata | 
| quadrilobata | |
| rotundata | |
| semicircularis |