Subgenus
Achatella (Achatella) Delo, 1935
Aiheeseen liittyvät julkaisut
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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Luokittelu
| 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) |