Species
Tetrada (Tallinnopsis) calkeri (Bonnema, 1909)
Synonymy list
1858     Beyrichia complicata Salter — Schmidt , pp. 195
1909     Tetradella Calkeri nov. spec. — Bonnema , pp. 35, fig. 3:15-22
1949     Ogmoopsis calkeri (Bonnema) — Hessland , pp. 324, 338
1953     Tetradella calkeri Bonnema — Neckaja , pp. 322, fig. 2:3
1959     Tallinnopsis calkeri — Sarv , pp. 67, fig. 3:1-7
1976     Tetrada calkeri — Schallreuter , pp. 165-166
Selection of related publications
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. 
Bonnema, J. H. 1909. Beiträge zur Kenntnis der Osrtacoden der Kuckersschen Schicht (C2).  Mitteilungen Mineralogisch-Geologischen Instituts In Groningen   2,   1,   1-84.
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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 | (Tallinnopsis) | 
| Species | calkeri | 
| excisa | |
| gudensis | |
| iewica | |
| ordinata | |
| porosicalkeri | |
| ramigalensis | |
| vaiguvenis | |
| vievensis | 
References based on distribution
- Sarv, L., 1959 Kodasema, Harju County
- Sarv, L., 1959 Lasnamäe quarry
- Sarv, L., 1959 Humala
- Neckaja, 1953 Ubja
- Neckaja, 1953 Vanamõisa, Harjumaa
- Neckaja, 1953 Alekseevka quarry, Leningrad Oblast