Subgenus

Tetrada (Perplana) Sidaravičiene, 1992

Selection of related publications

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

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.

List of species

1. Tetrada (Perplana) bisulcata (Sarv, 1963) | Idavere Substage→Oandu Stage

2. Tetrada (Perplana) pabradensis Sidaravičiene, 1992 | Keila Stage

3. Tetrada (Perplana) perplana (Neckaja, 1953) | Uhaku Stage→Oandu Stage

Classification

Organism group	Biota
Kingdom	Animalia
Phylum	Arthropoda
Subphylum	Crustacea
Superclass	Oligostraca
Class	Ostracoda
Subclass	Podocopa
Order	Palaeocopida
Suborder	Beyrichicopina
	Palaeocopa
Family	Ctenonotellidae
Genus	Tetrada
Subgenus	(Neotsitrella)
	(Perplana)
Species	bisulcata
	pabradensis
	perplana
Subgenus	(Tallinnopsis)
	(Tetrada)
Species	hibyi
	ventroconcava
Subspecies	troppenzorum