Genus

Pachystrophia Perner, 1903

Selection of related publications

Vinn, O., Liang, K., Isakar, M., Alkahtane, A. A., Al Farraj, S., El Hedeny, M. 2025. The evolutionary innovation of coral colonization on motile gastropod shells arose shortly after the Great Ordovician Biodiversification Event in Baltica. Palaios 40, 2, 62-69. DOI:10.2110/palo.2024.010

Rõõmusoks, A. 1970. Stratigraphy of the Viruan Series (Middle Ordovician) in Northern Estonia, I. pp. 1-346. Valgus.

Eichwald, E. 1861. Paleontologiâ Rossii. Drevnij period. II. Fauna grauvakkovoj, gornoizvestkovoj i medistoslancevatoj formacij Rossii. pp. 1-521. R. Golike (former Ya. Ionsona).

Eichwald, E. 1856. Beitrag zur geographischen Verbreitung der fossilen Thiere Russlands. Alte Periode. (Fortsetzung. S. Bulletin 1856. N 2. pag. 406.). Bulletin of the Moscow Society of Naturalists. Geological series 29, IV, 555-608.

List of species

1. Pachystrophia devexa (Eichwald, 1860) | Haljala Stage→Keila Stage

2. Pachystrophia dilatata (Koken, 1896) | Kunda Stage

3. Pachystrophia vortex (Eichwald, 1856) | Vormsi Stage

Classification

Organism group	Biota
Kingdom	Animalia
Phylum	Mollusca
Class	Gastropoda
Subclass	Eogastropoda
Order	Euomphalina
Superfamily	Euomphaloidea
Family	Holopeidae
Genus	Holopea
	Pachystrophia
Species	devexa
	dilatata
	helicoides
	vortex