Species
Pachystrophia devexa (Eichwald, 1860)
Synonyymit
1859     Euomphalus devexus sp. n.  — Eichwald , fig. 43: 18
1860     Euomphalus devexus m. — Eichwald , pp. 1144
1861     Euomphalus devexus — Eichwald , pp. 330, fig. XXII 18 a-b
1868     Euomphalus devexus Eichwald — Bigsby , pp. 153
1889     Euomphalus devexus Eichwald — Koken , pp. 409
1896     Euomphalus devexus Eichwald — Koken , pp. 398
1897     Euomphalus devexus Eichwald — Koken , pp. 181
1925     Pachystrophia devexa (Eichwald, 1859) — Koken & Perner , pp. 123, fig. 15: 16-21
1941     Pachystrophia devexa (Eichwald) — Knight , pp. 225, fig. 74:3
1955     Pachystrophia aff. devexa (Eichwald) — Vostokova , pp. 97, fig. 4:1
Aiheeseen liittyvät julkaisut
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). 
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Luokittelu
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Mollusca | 
| Class | Gastropoda | 
| Subclass | Eogastropoda | 
| Order | Euomphalina | 
| Superfamily | Euomphaloidea | 
| Family | Holopeidae | 
| Genus | Pachystrophia | 
| Species | devexa | 
| dilatata | |
| helicoides | |
| vortex | 
Levinneisyys ja viitteet
- Rõõmusoks, 1970a Aluvere quarry Jõhvi Substage
- Eichwald, 1861a