Genus
Tetrada Neckaja, 1958
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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 |
| Subfamily | Ctenentominae |
| Ctenonotellinae | |
| Steusloffiinae | |
| Tallinnellinae | |
| Wehrliinae | |
| Genus | Kiesowia |
| Piretopsis | |
| Pseudorakverella | |
| Quadritia | |
| Semikiesowia | |
| Telegraphia | |
| Tetrada | |
| Subgenus | (Neotsitrella) |
| (Perplana) | |
| (Tallinnopsis) | |
| (Tetrada) | |
| Species | hibyi |
| ventroconcava | |
| Subspecies | troppenzorum |