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

Schallreuter, R. 1985. Aurel Krause's "Geschiebe mit Beyrichia rostrata" (Ostracoda; Ordoviz). Mitteilungen aus dem Geologisch-Paläontologischen Institut der Universität Hamburg 59, 99-136.

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.

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 juures oleva Loodusuurijate Seltsi Aruanded 43, 65-138.

Öpik, A. 1937. Ostracoda from the Ordovician Uhaku and Kukruse formations of Estonia. Tartu Ülikooli Geoloogia Instituudi Toimetused 50, 1-58.

Öpik, A. 1935. Amphipora ramosa (Phill.) in the Marine Devonian of Estonia. Tartu Ülikooli Geoloogia Instituudi Toimetused 41, 1-7.

Bonnema, J. H. 1909. Beiträge zur Kenntnis der Osrtacoden der Kuckersschen Schicht (C2). Mitteilungen Mineralogisch-Geologischen Instituts In Groningen 2, 1, 1-84.

List of species

1. Sigmoopsis (Sigmoopsis) cornuta (Krause, 1897) | Kukruse Stage→Oandu Stage

2. Sigmoopsis (Sigmoopsis) kernavensis Sidaravičiene, 1992 | Oandu Stage→Rakvere Stage

3. Sigmoopsis (Sigmoopsis) obliquejugata (Schmidt, 1858) | Uhaku Stage→Idavere Substage

4. Sigmoopsis (Sigmoopsoides) niemeyeri Schallreuter, 1985 | Kunda Stage

5. Sigmoopsis (Sigmoopsoides) perpunctata (Öpik, 1937) | Aseri Stage→Idavere Substage

6. Sigmoopsis (Sigmoopsoides) sigmoopsoides Schallreuter, 1964 | Kukruse Stage→Jõhvi Substage

7. Sigmoopsis granulata (Sarv, 1956) | Oandu Stage→Rakvere Stage

8. Sigmoopsis lamina Sarv, 1959 | Kukruse Stage→Haljala Stage

9. Sigmoopsis platyceras (Öpik, 1937) | Uhaku Stage→Kukruse Stage

10. Sigmoopsis rostrata (Krause, 1892) | Kukruse Stage→Nabala Stage

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	Concavhithis
	Lomatobolbina
	Semibolbina
	Severella
	Severobolbina
	Seviculina
	Sigmoopsis
Subgenus	(Sigmoopsis)
	(Sigmoopsoides)
Species	granulata
	lamina
	platyceras
	rostrata
Genus	Valdarella