Plaesiomyidae

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 ==References==