Fossils of species within this very ancient genus can be found in sediments from the
Devonian period to recent (age range: 409.1 to 0.0 Ma). File:Modiolus bipartitus 01.jpg|
Modiolus bipartitusMiddle Jurassic File:Modiolus giganteus 01.jpg|
Modiolus giganteusMiddle Jurassic ==Species==