Praenuculinae

The majority of Praenuculidae genera possess teeth with a chevron concavity that faces towards the outer sides of the shell and a chevron point facing the umbo. Palaeoconcha is known from at least four species ranging across Europe, Asia, North America, and South America. Both Paulinea and Pensarnia were described by Cope in 1997 from fossils found in early Arenig sediments of South Wales. The genus Similodonta is known from several species which range across North America, Asia, and Europe. The genus Eritropis was formerly included in the subfamily, however it was moved to a new family, Eritropidae by John C. Cope in 2000. Deceptrix was included in Praenuculinae and the genus Cardiolaria was listed in Praenuculidae, without subfamily placement, by Teresa M. Sánchez in her 1999 description of the Praenuculidae subfamilies. However both Deceptrix and Cardiolaria are currently accepted as members of the family Cardiolariidae erected by Cope in 1997. ==Genera==

• Cuyopsis • Fidera • Ledopsis • Palaeoconcha • Paulinea • Pensarnia • Praeleda • Praenucula (type genus) • Trigonoconcha • Similodonta • Villicumia ==References==