Species
Tvaerenella expedita Sarv, 1959
Type specimen data
Synonymy list
1954     Öpikella cf. umbilicata (Kummerow) — Henningsmoen , pp. 94-95, fig. 5:1-5
1959     Tvaerenella expedita sp. n. — Sarv , pp. 34-35, fig. 5:23-28
1972     Tvaerenella expedita Sarv — Pranskevičius , pp. 75, fig. 7:1
1979     Tvaerenella expedita Sarv — Ivanova , pp. 94
1990     Tvaerenella expedita  — Meidla et al. , pp. 135
1992     Tvaerenella expedita Sarv, 1959 — Sidaravičiene , pp. 102, fig. 27:2-3
1996     Tvaerenella expedita Sarv, 1959 — Meidla , pp. 39, fig. 5:9-11
2008     Tvaerenella plana (Krause, 1889) — Schallreuter & Schallreuter , pp. 809
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.
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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 | |
| Superfamily | Hollinacea | 
| Family | Tvaerenellidae | 
| Subfamily | Tvaerenellinae | 
| Genus | Tvaerenella | 
| Species | carinata | 
| expedita | |
| granosa | |
| longa | |
| magna | |
| modesta | |
| plana | |
| postpleta | |
| pulex | |
| stossmeisteri | |
| tuberculata | |
| umbilicata | 
References based on distribution
- Meidla, 1996a Orjaku borehole 46.6 - 75.9 Vormsi Stage
- Meidla, 1996a Förby F-369 borehole 5 - 25.5
- Meidla, 1996a Puhmu 567 borehole 39.7 - 90.7
- Meidla, 1996a Laeva 18 borehole 179.1 - 198.7
- Sidaravičiene, 1992 Kalvarija borehole 863.5 - 867.5
- Sidaravičiene, 1992 Geluva 114 borehole 1150.5 - 1153.7
- Sarv, L., 1959 Saxby
- Sarv, L., 1959 Moe
- Pranskevičius, 1972a Ukmerge 10 borehole 510.5 - 513