Species
Sigmoopsis platyceras (Öpik, 1937)
Type specimen data
Synonymy list
1937     Ceratopsis platyceras n. sp. — Öpik , pp. 90, fig. 2:6
1953     Ceratopsis platyceras n — Neckaja , pp. 338, fig. 6:1-3
1959     Sigmoopsis platyceras (Öpik) — Sarv , pp. 113, fig. 20:1-5
1975     Sigmoopsis platyceras (Öpik) — Přibyl , pp. 12, fig. Abb.1:9-10
Selection of related publications
Nõlvak, J. 1972. A characterization of the boundary beds of the Kukruse and Idavere stages in the Lipu boring.  Loodusuurijate Seltsi Aastaraamat, pp. 39-59.   Loodusuurijate Selts. 
Sarv, L. 1959. Ordovician ostracodes in the Estonian S.S.R..  ENSV TA Geoloogia Instituudi Uurimused   IV,      1-210.
Neckaja, A. I. 1953. Tetradellidy ordovika Pribaltiki i ih stratigraficheskoe znachenie.  Trudy Vsesoûznogo Naučno-Issledovatel'skogo Geologo-Razvedočnogo Instituta (VNIGRI)         309-363.  Gostoptehizdat. 
Öpik, A. 1937. Ostracoda from the Ordovician Uhaku and Kukruse formations of Estonia.  Tartu Ülikooli Geoloogia Instituudi Toimetused   50,      1-58.
Öpik, A. 1937. Ostracoda from the Ordovician Uhaku and Kukruse formations of Estonia.  Tartu Ülikooli juures oleva Loodusuurijate Seltsi Aruanded   43,      65-138.
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Arthropoda | 
| Subphylum | Crustacea | 
| Superclass | Oligostraca | 
| Class | Ostracoda | 
| Subclass | Podocopa | 
| Order | Palaeocopida | 
| Suborder | Beyrichicopina | 
| Superfamily | Tetradelloidea | 
| Family | Tetradellidae | 
| Subfamily | Sigmoopsinae | 
| Genus | Sigmoopsis | 
| Subgenus | (Sigmoopsis) | 
| (Sigmoopsoides) | |
| Species | granulata | 
| lamina | |
| platyceras | |
| rostrata | 
References based on distribution
- Öpik, 1937a Kukruse
- Öpik, 1937i Kohtla-Järve Kukruse Stage
- Neckaja, 1953 Pihkva