Species
Homotrypa instabilis (Ulrich, 1886)
Synonymy list
1886     Homotrypella instabilis  — Ulrich , pp. 83
1893     Homotrypella instabilis  — Ulrich , pp. 229, fig. 18.9-20
1911     Homotrypella instabilis Ulrich — Bassler , pp. 189, fig. text fig. 101, 102
1953     Homotrypella instabilis Ulr. — Modzalevskaya , pp. 101
1977     Homotrypella instabilis Ulrich, 1886 — Fritz 
1978     Homotrypa instabilis Ulrich, 1886 — Astrova , pp. 95
2009     Homotrypella instabilis — Pachut & Fisherkeller , pp. 404
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. 
Modzalevskaya, E. A. 1953. Trepostomaty ordovika Pribaltiki i ih stratigraficheskoe znachenie.  Trudy Vsesoûznogo Naučno-Issledovatel'skogo Geologo-Razvedočnogo Instituta (VNIGRI)         91-167.  Gostoptehizdat. 
Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Bryozoa | 
| Class | Stenolaemata | 
| Superorder | Palaeostomata | 
| Order | Trepostomata | 
| Suborder | Halloporina (suborder) | 
| Family | Monticuliporidae | 
| Subfamily | Monticuliporinae | 
| Genus | Homotrypa | 
| Species | alata | 
| cribrosa | |
| cumingsi | |
| curvata | |
| flabellaris | |
| grandialveolata | |
| granulifera | |
| hospitalis | |
| instabileformis | |
| instabilis | |
| modzalevskae | |
| obliqua | |
| ordoviciana | |
| pauli | |
| peculiaris | |
| similis | |
| subcurvata | |
| vacua | 
References based on distribution
- Modzalevskaya, 1953 Aseri Stage
- Astrova, 1978 Aseri Stage