Family
Trigonorhynchiidae Schmidt, 1965
Selection of related publications
Hints, L., Harper, D. A. T. 2015. The Hirnantian (Late Ordovician) brachiopod fauna of the East Baltic: Taxonomy of the key species.  Acta Palaeontologica Polonica   60,   2,   395-420. DOI:10.4202/app.2013.0010
Kaljo, D., Hints, L., Männik, P., Nõlvak, J. 2008. The succession of Hirnantian events based on data from Baltica: brachiopods, chitinozoans, conodonts, and carbon isotopes.  Estonian Journal of Earth Sciences   57,   4,   197-218. DOI:10.3176/earth.2008.4.01
Thomsen, E., Jin., J., Harper, D. A. T. 2006. Early Silurian brachiopods (Rhynchonellata) from the Sælabonn Formation of the Ringerike district, Norway.  Bulletin of the Geological Society of Denmark   53,      111-126. DOI:10.37570/bgsd-2006-53-06
Musteikis, P., Modzalevskaya, T. L. 2002. Some Silurian brachiopods from Lithuania and their palaeobiogeographical significance.  Palaeontology   45,   3,   595–626. DOI:10.1111/1475-4983.00251
Rubel, M., Musteikis, P., Popov, L. 1984. Sistematicheskii spisok brahiopod silura Pribaltiki [Систематический список брахиопод силура Прибалтики]. pp. 1-36.  Eesti Teaduste Akadeemia. 
Rubel, M., Rozman, H. 1977. New species of Silurian rhynchonelloid species of Estonia.  Facies and fauna of the Baltic Silurian, pp. 213-239.   Academy of Sciences of the Estonian S. S. R. Institute of Geology. 
Rõõmusoks, A. 1964. Some brachiopods from the Ordovician of Estonia.  Tartu Riikliku Ülikooli Toimetised   153,   II,   3-28.
Oraspõld, A. L. 1956. New brachiopods from the Jõhvi, Keila and Vasalemma stages.  ENSV TA Geoloogia Instituudi Uurimused   I,      41-67.
List of species
2. Hemitoechia undvaensis Rubel, 1977 | Jaani Stage
4. Plectothyrella crassicostis (Dalman, 1828) | Hirnantian
5. Rostricellula nobilis (Oraspõld, 1956) | Oandu Stage
6. Rostricellula wadti Thomsen, Jin et Harper, 2006 | Rhuddanian
7. Trigonirhynchia stricklandii (J. de. C. Sowerby, 1839) | Silurian
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Brachiopoda | 
| Subphylum | Rhynchonelliformea | 
| Class | Rhynchonellata | 
| Order | Rhynchonellida | 
| Superfamily | Rhynchotrematoidea | 
| Family | Leptocoeliidae | 
| Machaerariidae | |
| Orthorhynchulidae | |
| Rhynchotrematidae | |
| Trigonorhynchiidae | |
| Subfamily | Hemitoechiinae | 
| Rostricellulinae | |
| Trigonirhynchiinae | 
 See also