Species
Homotrypa similis Foord, 1883
Synonymy list
1883     Homotrypa similis — Foord , pp. 10, fig. 2:2
1893     Homotrypa similis — Ulrich , pp. 242, fig. XX 28-33
1911     Homotrypa similis Foord — Bassler , pp. 185, fig. text fig. 97,98
1911     Homotrypella cribrosa, new species — Bassler , pp. 192, fig. 13; text fig. 103
1953     Homotrypa similis Foord — Modzalevskaya , pp. 101
1957     Homotrypa similis — Fritz , pp. 23, fig. XIV 4,5
1965     Homotrypa similis — Astrova , pp. 200, fig. XXXV 1
1968     Homotrypa similis — Bork et Perry , pp. 1052, fig. 135:6-9
1970     Homotrypa similis Foord — Rõõmusoks , pp. 328, fig. table 17
1970     Homotrypella cribrosa Bassler — Rõõmusoks , pp. 328, fig. table 17
Selection of related publications
Pushkin, V. I. 1987. Ordovikskie mšanki podotrâda Halloporina Belorussii i smežnyh rajonov Vostočno- Evropejskoj platformy.  Ordovik Belorussii, pp. 145-232.   Nauka i Tehnika. 
Rõõmusoks, A. 1970. Stratigraphy of the Viruan Series (Middle Ordovician) in Northern Estonia, I. pp. 1-346.  Valgus. 
Männil, R. M. 1959. Questions of stratigraphy and bryozoans of the Ordovician of Estonia. pp. 1-852.  Institut Geologii Akademii Nauk Estonskoi SSR. 
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 | Homotrypa | 
| Species | alata | 
| cribrosa | |
| cumingsi | |
| curvata | |
| flabellaris | |
| grandialveolata | |
| granulifera | |
| hospitalis | |
| instabileformis | |
| instabilis | |
| modzalevskae | |
| obliqua | |
| ordoviciana | |
| pauli | |
| peculiaris | |
| similis | |
| subcurvata | |
| vacua | 
References based on distribution
- Bassler, 1911b Üksnurme
- Pushkin, 1987a Vangishki 205 borehole 427.8 - 428.6
- Pushkin, 1987a Rostov 1 borehole 1509 - 1512
- Rõõmusoks, 1970a Üksnurme Oandu Stage
- Rõõmusoks, 1970a Rakvere Oandu Stage
- Rõõmusoks, 1970a Vasalemma Oandu Stage