Species
Mesotrypa egena Bassler, 1911
Synonymy list
1911     Mesotrypa egena, new species — Bassler , pp. 198, fig. text fig. 107
1953     Mesotrypa egena Bassl. — Modzalevskaya , pp. 102
1978     Mesotrypa egena Bassler, 1911 — Astrova , pp. 100
2012     Mesotrypa egena Bassler, 1911 — Ernst & Nakrem , pp. 30, fig. 8C-I, table 4
Selection of related publications
Ernst, A., Nakrem, H. 2012. Late Ordovician (Sandbian) bryozoans and their depositional environment, Furuberget Formation, Mjøsa District, Oslo Region, Norway.  Bulletin of Geosciences   87,   1,   21-44. DOI:10.3140/bull.geosci.1316
Männil, R. M. 1959. Questions of stratigraphy and bryozoans of the Ordovician of Estonia. pp. 1-852.  Institut Geologii Akademii Nauk Estonskoi SSR. 
Modzalevskaya, E. A. 1953. Trepostomaty ordovika Pribaltiki i ih stratigraficheskoe znachenie.  Trudy Vsesoûznogo Naučno-Issledovatel'skogo Geologo-Razvedočnogo Instituta (VNIGRI)         91-167.  Gostoptehizdat. 
Bassler, R. S. 1911. The Early Paleozoic Bryozoa of the Baltic Provinces.  Bulletin of the US National Museum   77,      1-382.
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Bryozoa | 
| Class | Stenolaemata | 
| Superorder | Palaeostomata | 
| Order | Trepostomata | 
| Suborder | Halloporina (suborder) | 
| Family | Monticuliporidae | 
| Subfamily | Monticuliporinae | 
| Genus | Mesotrypa | 
| Species | bystrowi | 
| discoidea | |
| egena | |
| esthonica | |
| excentrica | |
| expressa | |
| gutta | |
| insolita | |
| mesoporica | |
| piriformis | |
| raritabulata | |
| strumaeformis | |
| suprasilurica | |
| torosa | |
| tuberculata | |
| volchovensis | |
| Subspecies | orientalis | 
References based on distribution
- Bassler, 1911b Ämari old quarry Keila Stage
- Ernst & Nakrem, 2012 Sandbian
- Ernst & Nakrem, 2012 Furuberget, Norway Sandbian
- Modzalevskaya, 1953 Jõhvi Substage