Species
Pseudolingula quadrata (Eichwald, 1829)
Synonymy list
1829     Crania quadrata — Eichwald , pp. 273, fig. 4:2
1840     Lingula quadrata m. — Eichwald , pp. 190-191
1840     Lingula quadrata m. — Eichwald , pp. 164-165
1856     Lingula quadrata — Eichwald , pp. 452
1857     Lingula quadrata — Eichwald , pp. 119
1860     Lingula quadrata m. — Eichwald , pp. 917
1861     Lingula quadrata — Roemer , pp. 49, fig. 5:15
1890     Lingula quadrata — Gagel , pp. 19, fig. 1:9
1954     Lingula quadrata — Alichova , pp. 30, fig. 18:1
1976     Pseudolingula quadrata (Eichwald) — Tsegelnjuk , pp. 5, fig. 1:1,2
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Brachiopoda | 
| Subphylum | Linguliformea | 
| Class | Lingulata | 
| Order | Lingulida | 
| Superfamily | Linguloidea | 
| Family | Pseudolingulidae | 
| Genus | Pseudolingula | 
| Species | nana | 
| quadrata |