Plaesiomyidae
| Plaesiomyidae Temporal range: Late Tremadocian-Early Lochkovian
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| Fossils of Plaesiomys subquadrata | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Brachiopoda |
| Class: | Rhynchonellata |
| Order: | †Orthida |
| Superfamily: | †Orthoidea |
| Family: | †Plaesiomyidae Schuchert, 1913 |
Plaesiomyidae is a family of extinct lamp shells belonging to the order Orthida.