Subgenus

Tetrada (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
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
2. Tetrada (Tetrada) harpa (Krause, 1892) | Keila Stage→Oandu Stage
3. Tetrada (Tetrada) krausei (Steusloff, 1895) | Idavere Substage→Rakvere Stage
4. Tetrada (Tetrada) memorabilis (Neckaja, 1953) | Idavere Substage→Keila Stage
5. Tetrada (Tetrada) neckajae Meidla, 1986 | Nabala Stage→Vormsi Stage
6. Tetrada (Tetrada) ovalis (Sarv, 1959) | Keila Stage→Oandu Stage
7. Tetrada (Tetrada) pseudoiewica Sidaravičiene, 1992 | Jõhvi Substage→Oandu Stage
8. Tetrada (Tetrada) variabilis Meidla, 1986 | Rakvere Stage→Nabala Stage
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Klassificering
Organism groupBiota
KingdomAnimalia
PhylumArthropoda
SubphylumCrustacea
SuperclassOligostraca
ClassOstracoda
SubclassPodocopa
OrderPalaeocopida
SuborderBeyrichicopina
Palaeocopa
FamilyCtenonotellidae
GenusTetrada
Subgenus(Neotsitrella)
(Perplana)
(Tallinnopsis)
(Tetrada)
Speciesgrandis
harpa
krausei
memorabilis
neckajae
ovalis
pseudoiewica
variabilis
hibyi
ventroconcava
Subspeciestroppenzorum