| Plaesiomyidae Temporal range: Late Tremadocian-Early Lochkovian
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| Fossils of Plaesiomys subquadrata | |
Scientific classification 
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| 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.
Fossil record
Fossils of Plaesiomyidae are found in marine strata from the Ordovician until the Silurian (age range: from 478.6 to 418.7 years ago.).1
Genera
- †Austinella Foerste, 1909
- †Bokotorthis Popov et al., 2000
- †Campylorthis Ulrich and Copper, 1942
- †Chaulistomella
- †Dinorthis Hall and Clarke, 1892
- †Evenkina
- †Madiorthis Zuykov and Harper, 2008
- †Metorthis
- †Multicostella
- †Plaesiomys Hall and Clarke, 1892
- †Retrorsirostra Schuchert and Cooper, 1932
- †Valcourea