Subclass
Palaeoheterodonta Newell, 1965
Aiheeseen liittyvät julkaisut
Vinn, O., Ernst, A., Isakar, M., El-Hedeny, I Almansour, M., Al Farraj, S. 2024. Cryptic fauna in abandoned bivalve shells and taphonomy of bivalve steinkerns in the Late Ordovician of Baltica.  Historical Biology         1-6. DOI:10.1080/08912963.2024.2383702
Toom, U., Vinn, O., Isakar, M., Madison, A., Hints, O. 2020. Small faecal pellets in Ordovician shelly fossils from Estonia, Baltoscandia.  Estonian Journal of Earth Sciences   69,   1,   1-19. DOI:10.3176/earth.2020.01
Kiselev, G. N., Sinicyna, I. N., Isakar, M. A., Mironova, M. G., Saladzhius, V. Y. 1990. Atlas mollûskov verhnego ordovika i silura severo-zapada Vostočno-Evropejskoj platformy. pp. 1-80.  Leningrad University. 
Isakar, M., Sinicyna, I. 1985. Redescription of E. Eichwald's Ordovician bivalve species.  Eesti NSV Teaduste Akadeemia Toimetised. Geoloogia / Известия Академии наук Эстонской ССР. Геология   34,   2,   46-54. DOI:10.3176/geol.1985.2.02
Saladžius, V. J. 1966. Mollusk fauna of the Silurian deposits of the south of the East Baltic territory.  Palaeontology and stratigraphy of the Baltic and the Byelorussia. Number I (VI), pp. 31-73.   Mintis. 
Bekker, H. 1921. The Kuckers stage of the Ordovician Rocks in NE Estonia.  Acta et Commentationes Universitatis Tartuensis   II,   1,   1-92.
List of species
3. Aristerella nitiduloides Bekker, 1921 | Kukruse Stage
5. Mimerodonta atlei Liljedahl, 1994 | Ludlow
6. Mimerodonta njordi Liljedahl, 1994 | Gorstian
7. Modiolopsis kalvariensis Saladzhius, 1966 | Ludlow
9. Modiolopsis silurica (Eichwald, 1840) | Rakvere Stage
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Luokittelu
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Mollusca | 
| Class | Bivalvia | 
| Subclass | Heterodonta | 
| Isofilibranchia | |
| Palaeoheterodonta | |
| Order | Modiomorphoida | 
| Unionida | |
| Subclass | Protobranchia | 
| Pteriomorphia | |
| Cohort | Mytilomorphi | 
| Superorder | Nepiomorphia | 
| Ostreiformii | |
| Order | Fordillida | 
| Pectinida | |
| Solenida | |
| Trigoniida | |
| Tuarangiida | |
| Superfamily | Pandoroidea |