Family
Tryblidiidae Zittel, 1899
List of species
1. Pilina esthonum (Koken, 1897) | Porkuni Stage
2. Pilina ovoideum (Koken et Perner, 1925) | Porkuni Stage
3. Pilina unguis (Lindström, 1880) | Silurian
4. Tryblidium reticulatum Lindström, 1880 | Silurian
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Classification
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Mollusca |
| Class | Tergomya |
| Order | Tryblidiida |
| Superfamily | Tryblidioidea |
| Family | Tryblidiidae |
| Subfamily | Tryblidiinae |
| Genus | Proplina |