Species
Hemiphragma pygmaeum Bassler, 1911
Synonymy list
1911     Hemiphragma pygmaeum, new species — Bassler , pp. 289, fig. text fig. 176
1953     Hemiphragma pygmaeum Bassl. — Modzalevskaya , pp. 104
1978     Hemiphragma pygmaeum Bassler, 1911 — Astrova , pp. 53
2008     Hemiphragma pygmaeum Bassler, 1911 — Buttler et al. , pp. 11, fig. 2.1-2.2
Selection of related publications
Astrova, G. G. 1978. Istoriâ razvitiâ, sistema i filogeniâ mšanok otrâda Trepostomata.  Transactions of the Paleontological Institute (PIN)   169,      1-240.  Nauka. 
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 | Dittoporidae | 
| Genus | Hemiphragma | 
| Species | batheri | 
| convexa | |
| insolitum | |
| irrasum | |
| ottawaense | |
| panderi | |
| priscum | |
| pygmaeum | |
| rotundatum | |
| subirrasum | |
| tenuimurale | 
References based on distribution
- Bassler, 1911b Böda, Öland
- Modzalevskaya, 1953 Kukruse Stage
- Astrova, 1978