Plaesiomyidae

Plaesiomyidae is a family of extinct lamp shells belonging to the order Orthida.

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]

• †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