Subgenus

Tetrada (Tetrada) Neckaja, 1958

Aiheeseen liittyvät julkaisut
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 StageOandu Stage
3. Tetrada (Tetrada) krausei (Steusloff, 1895) | Idavere SubstageRakvere Stage
4. Tetrada (Tetrada) memorabilis (Neckaja, 1953) | Idavere SubstageKeila Stage
5. Tetrada (Tetrada) neckajae Meidla, 1986 | Nabala StageVormsi Stage
6. Tetrada (Tetrada) ovalis (Sarv, 1959) | Keila StageOandu Stage
7. Tetrada (Tetrada) pseudoiewica Sidaravičiene, 1992 | Jõhvi SubstageOandu Stage
8. Tetrada (Tetrada) variabilis Meidla, 1986 | Rakvere StageNabala Stage