Species
Tetrada (Tetrada) harpa (Krause, 1892)
Synonymy list
1892     Beyrichia (Tetradella) harpa n. sp. — Krause , pp. 394, fig. 22:15
1959     Tallinnopsis ovalis (Oraspõld, in coll.) — Sarv , pp. 70-71, fig. 13:16-21
1985     Tetrada harpa (Krause) — Schallreuter , pp. 108-109, fig. 4:1-3
1992     Tetrada (Tetrada) ovalis (Sarv) — Sidaravičiene , pp. 113-114, fig. 29:11
1996     Tetrada (Tetrada) harpa (Krause, 1892) — Meidla , pp. 46, fig. 7:7
Selection of related publications
Meidla, T. 1996. Late Ordovician Ostracodes of Estonia. Fossilia Baltica 2. pp. 1-222.  Tartu University Press. 
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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 | (Tetrada) | 
| Species | grandis | 
| harpa | |
| krausei | |
| memorabilis | |
| neckajae | |
| ovalis | |
| pseudoiewica | |
| variabilis | 
References based on distribution
- Meidla, 1996a Orjaku borehole 133.7 -