Echinarachnius
Echinarachnius is a genus of sand dollars, belonging to the family Echinarachniidae.
Species of Echinarachnius have been around since the Pliocene epoch.
Species
- †Echinarachnius alaskensis Durham, 1957
- Echinarachnius asiaticus Michelin, 1859
- †Echinarachnius humilis Nisiyama, 1968
- †Echinarachnius kewi Grant & Eaton in Eaton, Grant & Allen, 1941
- †Echinarachnius naganoensis Morishita, 1953
- Echinarachnius parma
- †Echinarachnius rumoensis Hayasaka & Shibata, 1952
- †Echinarachnius subtumidus Nisiyama & Hashimoto, 1950