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

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.

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.

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.

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. 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) calkeri (Bonnema, 1909) | Uhaku Stage→Idavere Substage

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

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

8. Tetrada (Tallinnopsis) iewica (Neckaja, 1953) | Jõhvi Substage→Oandu Stage

9. Tetrada (Tallinnopsis) ordinata Sarv, 1959 | Keila Stage

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

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

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

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

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

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

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

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

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

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

20. Tetrada (Tetrada) pseudoiewica Sidaravičiene, 1992 | Jõhvi Substage→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
Subfamily	Ctenentominae
	Ctenonotellinae
	Steusloffiinae
	Tallinnellinae
	Wehrliinae
Genus	Kiesowia
	Piretopsis
	Pseudorakverella
	Quadritia
	Semikiesowia
	Telegraphia
	Tetrada
Subgenus	(Neotsitrella)
	(Perplana)
	(Tallinnopsis)
	(Tetrada)
Species	hibyi
	ventroconcava
Subspecies	troppenzorum