Subgenus

Sigmoopsis (Sigmoopsis) Henningsmoen, 1953

Selection of related publications

Sidaravičiene, N. 1992. Ordovician ostracods of Lithuania. pp. 1-252. LitNIIGRI.

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. 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

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
Subgenus	(Sigmoopsoides)
Species	granulata
	lamina
	platyceras
	rostrata