Subgenus
Tetrada (Neotsitrella) Sarv, 1963
Current taxon already exists. See initial taxon Tetrada (Perplana)
 Taxon ID: 4397
Fossil group: Ostracoda
Belongs to: Tetrada
Other version of taxon: Tetrada (Perplana)
Baltoscandian species (in database): 
Selection of related publications
Meidla, T. 1996. Late Ordovician Ostracodes of Estonia. Fossilia Baltica 2. pp. 1-222.  Tartu University Press. 
Sarv, L. 1959. Ordovician ostracodes in the Estonian S.S.R..  ENSV TA Geoloogia Instituudi Uurimused   IV,      1-210.
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 | 
| Superclass | Oligostraca | 
| Class | Ostracoda | 
| Subclass | Podocopa | 
| Order | Palaeocopida | 
| Suborder | Beyrichicopina | 
| Palaeocopa | |
| Family | Ctenonotellidae | 
| Genus | Tetrada | 
| Subgenus | (Neotsitrella) | 
| Species | Tetrada (Perplana) longata | 
| Subgenus | (Perplana) | 
| (Tallinnopsis) | |
| (Tetrada) | |
| Species | hibyi | 
| ventroconcava | |
| Subspecies | troppenzorum |