Subclass
Orthogastropoda Ponder et Lindberg, 1997
Selection of related publications
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
Frisk, Ǻ. M., Ebbestad, J. O. R. 2007. Paragastropoda, Tergomya and Gastropoda (Mollusca) from the Upper Ordovician Dalby Limestone, Sweden. GFF 129, 2, 83-99. DOI:10.1080/11035890701292083
Isakar, M. 1990. Bivalvia and Gastropoda.Field Meeting Estonia 1990. An Excursion Guidebook , pp. 64-65. Estonia Academy of Sciences.
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.
Öpik, A. 1930. Beiträge zur Kenntnis der Kukruse-(C2-C3-)Stufe in Eesti. IV. Tartu Ülikooli Geoloogia Instituudi Toimetused 24, 1-34.
Koken, E., Perner, J. 1925. Die Gastropoden des baltischen Untersilurs. Zapiski Rossiiskoi Akademii Nauk 37, 1, 1-318. Venemaa Teaduste Akadeemia.
Bekker, H. 1925. Lühike ülevaade Eesti geoloogiast (Eozoiline ja paleozoiline ladekond).Eesti Loodus. Äratrükk koguteosest "Eesti" , pp. 31-61.
Lindström, G. 1884. On the Silurian Gastropoda and Pteropoda of Gotland. Kungliga Svenska Vetenskapsakademiens Handlingar 19, 6, 1-250. P. A. Norstedt.
Kjerulf, T. 1865. Veiviser ved geologiske excursioner i Christiania Omegn med et Farvetrykt Kart or Flere Traensit. Universitätsprogram for andet Halvaar 1865. pp. . Brøgger & Christie's Bogtrykkeri.
Eichwald, E. 1860. Lethaea Rossica ou Paléontologie de la Russie. Premier volume. Ancienne Période en deux sections. pp. XIX+1–1657. E. Schweizerbart. DOI:10.5962/bhl.title.52391
Schmidt, Fr. 1858. Untersuchungen über die Silurische Formation von Ehstland, Nord-Livland und Oesel. Archiv für die Naturkunde Liv-, Ehst- und Kurlands 2, 1, 1-249. Heinrich Laakmann.
Eichwald, E. 1854. Die Grauwackenschichten von Liv- und Estland. Bulletin de la Société Imperiale des Naturalistes de Moscou 27, 1, 1-111.
Pacht, R. 1849. Der devonische Kalk in Livland. Ein Beitrag zur Geognosie der Ostseeprovinzen. pp. . J. C. Schünmann's Wittwe und C. Mattiesen.
List of species
3. Brachytomaria plautini Koken et Perner, 1925 | Kunda Stage
5. Cataschisma nitida (Koken et Perner, 1925) | Porkuni Stage
6. Cataschisma winkleri (Öpik, 1930) | Kukruse Stage
9. Deaechospira maritima (Koken, 1897) | Aseri Stage
10. Ectomaria nieszkowskii (Schmidt, 1858) | Porkuni Stage
11. Eocryptaenia singularis Koken et Perner, 1925 | Porkuni Stage
13. Eunema sulcifera (Eichwald, 1840) | Nabala Stage
14. Globonema piersalense (Koken, 1897) | Pirgu Stage
17. Hormotoma meyendorfi (Koken, 1896) | Porkuni Stage
18. Hormotoma rudis Koken et Perner, 1925 | Pirgu Stage
19. Hormotoma scorbiculata (Koken, 1897) | Pirgu Stage
20. Latitaenia aequicrescens (Koken, 1897) | Vormsi Stage
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Classification
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Mollusca |
| Class | Gastropoda |
| Subclass | Archaeobranchia |
| Archaeogastropoda | |
| Eogastropoda | |
| Neritimorpha | |
| Orthogastropoda | |
| Order | Murchisoniina |
| Family | Pleurotomariidae |
| Subclass | Prosobranchia |
| Streptoneura | |
| Order | Bellerophontida |
| Heterostropha | |
| Superfamily | Patelloidea |
| Genus | Semizona |