Plaesiomyidae

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.).

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