Genus

Tetrada Neckaja, 1958

Selection of related publications

Meidla, T. 1996. Late Ordovician Ostracodes of Estonia. Fossilia Baltica 2. pp. 1-222. Tartu University Press.

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

Meidla, T. 1986. Neue Ostrakoden aus dem Ordovizium des Baltikums. Eesti NSV Teaduste Akadeemia Toimetised. Geoloogia / Известия Академии наук Эстонской ССР. Геология 35, 1, 10-19. DOI:10.3176/geol.1986.1.02

Sidaravičiene, N. 1971. New ostracoda from Middle and Upper Ordovician of Lithuania. Palaeontology and stratigraphy of the Baltic and Byelorussia. Number III, pp. 23-36. Mintis.

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) longata (Sarv, 1959) | Keila Stage

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

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

5. Tetrada (Tallinnopsis) excisa Sidaravichiene, 1971 | Idavere Substage→Oandu Stage

6. Tetrada (Tallinnopsis) gudensis Sidaravičiene, 1992 | Keila Stage

7. Tetrada (Tallinnopsis) porosicalkeri Sidaravičiene, 1992 | Kukruse Stage→Jõhvi Substage

8. Tetrada (Tallinnopsis) ramigalensis Sidaravičiene, 1992 | Uhaku Stage→Idavere Substage

9. Tetrada (Tallinnopsis) vaiguvenis Sidaravičiene, 1992 | Idavere Substage→Oandu Stage

10. Tetrada (Tallinnopsis) vievensis Sidaravičiene, 1992 | Kukruse Stage→Jõhvi Substage

11. Tetrada (Tetrada) grandis (Sarv, 1959) | Keila Stage

12. Tetrada (Tetrada) harpa (Krause, 1892) | Keila Stage→Oandu Stage

13. Tetrada (Tetrada) krausei (Steusloff, 1895) | Idavere Substage→Rakvere Stage

14. Tetrada (Tetrada) memorabilis (Neckaja, 1953) | Idavere Substage→Keila Stage

15. Tetrada (Tetrada) neckajae Meidla, 1986 | Nabala Stage→Vormsi Stage

16. Tetrada (Tetrada) ovalis (Sarv, 1959) | Keila Stage→Oandu Stage

17. Tetrada (Tetrada) pseudoiewica Sidaravičiene, 1992 | Jõhvi Substage→Oandu Stage

18. Tetrada (Tetrada) variabilis Meidla, 1986 | Rakvere Stage→Nabala Stage

Classification

Organism group	Biota
Kingdom	Animalia
Phylum	Arthropoda
Subphylum	Crustacea
Class	Ostracoda
Order	Beyrichicopida
Suborder	Palaeocopa
Family	Ctenonotellidae
Subfamily	Tallinnellinae
Genus	Cerninella
	Homeokiesowia
	Laevanotella
	Neringa
	Quadritia
	Tallinnella
	Tallinnellina
	Tetrada
Subgenus	(Neotsitrella)
	(Perplana)
	(Tallinnopsis)
	(Tetrada)
Species	hibyi
	ventroconcava
Subspecies	troppenzorum