Subgenus
Achatella (Achatella) Delo, 1935
Selection of related publications
Schmidt, Fr. 1881. Revision der ostbaltischen silurischen Trilobiten nebst geognostischer Übersicht des ostbaltischen Silurgebiets. Abt. I. Phacopiden, Cheiruriden und Encrinuriden.  Mémoires de l´Académie Impériale des Sciences de St.-Petersbourg   30,   1,   1-237.
List of species
1. Achatella (Achatella) nieszkowskii (Schmidt, 1881) | Rakvere Stage
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Arthropoda | 
| Subphylum | Trilobita | 
| Order | Phacopida | 
| Suborder | Phacopina | 
| Family | Pterygometopidae | 
| Subfamily | Pterygometopinae | 
| Genus | Achatella | 
| Subgenus | (Achatella) | 
| Species | nieszkowskii | 
| Subgenus | (Vironiaspis) |