Species
Hemiphragma irrasum (Ulrich, 1886)
Synonymy list
1911 Hemiphragma irrasum (Ulrich) — Bassler , pp. 284, fig. text fig. 172,173
1953 Hemiphragma irrasum (Ulr.) — Modzalevskaya , pp. 104
1968 Hemiphragma irrasum (Ulrich, 1886) — Bork & Perry , pp. 342, fig. 44:1-3,5
1978 Hemiphragma irrasum (Ulrich, 1886) — Astrova , pp. 53
1996 Capillapora irrasa (Bassler) — Gorjunova , fig. XXII 1
Selection of related publications
Gorjunova, R. V. 1996. Phylogeny of the Paleozoic bryozoans. Transactions of the Paleontological Institute (PIN) 267, 1-163. Nauka.
Astrova, G. G. 1978. Istoriâ razvitiâ, sistema i filogeniâ mšanok otrâda Trepostomata. Transactions of the Paleontological Institute (PIN) 169, 1-240. Nauka.
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 Paldiski
- Modzalevskaya, 1953 Kunda Stage
- Astrova, 1978 Kunda Stage
- Gorjunova, 1996b Aluvere quarry Idavere Substage