Subgenus
Tetrada (Neotsitrella) Sarv, 1963
Selection of related publications
Meidla, T. 1996. Late Ordovician Ostracodes of Estonia. Fossilia Baltica 2. pp. 1-222. Tartu University Press.
List of species
1. Tetrada (Perplana) longata (Sarv, 1959) | Keila Stage
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Classification
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Arthropoda |
| Subphylum | Crustacea |
| Class | Ostracoda |
| Order | Beyrichicopida |
| Suborder | Palaeocopa |
| Family | Ctenonotellidae |
| Subfamily | Tallinnellinae |
| Genus | Tetrada |
| Subgenus | (Neotsitrella) |
| Species | Tetrada (Perplana) longata |
| Subgenus | (Perplana) |
| (Tallinnopsis) | |
| (Tetrada) | |
| Subspecies | troppenzorum |