Genus

Sigmoopsis Henningsmoen, 1953

Selection of related publications
Meidla, T. 1996. Late Ordovician Ostracodes of Estonia. Fossilia Baltica 2. pp. 1-222. Tartu University Press.
Nõlvak, J., Meidla, T., Uutela, A. 1995. Microfossils in the Ordovician erratic boulders from Southwestern Finland. Bulletin of the Geological Society of Finland 67, 2, 3-26. DOI:10.17741/bgsf/67.2.001
Sidaravičiene, N. 1992. Ordovician ostracods of Lithuania. pp. 1-252. LitNIIGRI.
Maletz, J. 1992. The proximal development in Anisograptis (Graptoloidea, Anisograptidae). Paläontologische Zeitschrift 66, 3-4, 297-309. DOI:10.1007/BF02985821
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. I. 1956. New species of ostracodes of the Vasalemma Stage (Upper Ordovician of Estonia). ENSV TA Geoloogia Instituudi Uurimused I, 30-40.
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.
List of species
1. Sigmoopsis (Sigmoopsis) cornuta (Krause, 1897) | Kukruse StageOandu Stage
3. Sigmoopsis (Sigmoopsis) obliquejugata (Schmidt, 1858) | Uhaku StageIdavere Substage
5. Sigmoopsis (Sigmoopsoides) perpunctata (Öpik, 1937) | Aseri StageIdavere Substage
7. Sigmoopsis granulata (Sarv, 1956) | Oandu StageRakvere Stage
8. Sigmoopsis platyceras (Öpik, 1937) | Uhaku StageKukruse Stage
9. Sigmoopsis rostrata (Krause, 1892) | Kukruse StageNabala Stage