Species
Sigmoopsis (Sigmoopsis) cornuta (Krause, 1897)
Synonymy list
1897     Ctenobolhina rostrata var. cornuta n. v. — Krause , pp. 937, fig. 25:3
1909     Ceratopsis cornuta — Bonnema , pp. 41, fig. 6:9
1953     Ceratopsis cornuta (Krause) — Neckaja , pp. 336, fig. 6:4-6
1959     Ceratopsis cornuta (Krause) — Sarv , pp. 115-116, fig. 20:10, 11
1982     Sigmoopsis (Sigmoopsis) cornuta (Krause, 1897) — Schallreuter , pp. 17-19, fig. 2:7-8
1982     Sigmoopsis cornuta (Krause) — Ulst et al. , pp. 125
1983     Sigmoopsis (Sigmoopsis) cornuta (Krause, 1897) — Schallreuter , pp. 180, fig. 10:3
1992     Sigmoopsis (Sigmoopsis) cornuta (Krause, 1897) — Sidaravičiene , pp. 47, fig. 10:7
2022     Sigmoopsis cornuta (Krause, 1897) — Melnikova , fig. 4c
Selection of related publications
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.
Bonnema, J. H. 1909. Beiträge zur Kenntnis der Osrtacoden der Kuckersschen Schicht (C2).  Mitteilungen Mineralogisch-Geologischen Instituts In Groningen   2,   1,   1-84.
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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) | 
| Species | cornuta | 
| kernavensis | |
| obliquejugata | 
References based on distribution
- Sidaravičiene, 1992 Vangishki 205 borehole 445.9 - 448.8
- Sidaravičiene, 1992 Leliai 284 borehole 475.7 - 481.8
- Neckaja, 1953 Alekseevka quarry, Leningrad Oblast
- Neckaja, 1953 Ubja
- Neckaja, 1953 Pihkva