Orthoidea
Orthoidea is a superfamily of brachiopods containing the families:
- Family Orthidae
- Family Anomalorthidae
- Family Bohemiellidae
- Family Glyptorthidae
- Family Hesperonomiidae
- Family Hesperorthidae
- Family Lycophoriidae
- Family Nanorthidae
- Family Orthidiellidae
- Family Plaesiomyidae
- Family Poramborthidae
- Family Productorthidae
- Family Whittardiidae