''Echinarachnius'' is a genus of

sand dollar Sand dollars (also known as sea cookies or snapper biscuits in New Zealand and Brazil, or pansy shells in South Africa) are species of flat, burrowing sea urchins belonging to the order Clypeasteroida. Some species within the order, not quite a ...

s, belonging to the family Echinarachniidae . Kroh, A.; Mooi, R. (2020). World Echinoidea Database. Echinarachnius Gray, 1825. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=158061 on 2020-12-31 Species of ''Echinarachnius'' have been around since the

Pliocene The Pliocene ( ; also Pleiocene) is the epoch (geology), epoch in the geologic time scale that extends from 5.33 to 2.58Echinarachnius 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'' (Lamarck, 1816) *†'' Echinarachnius rumoensis'' Hayasaka & Shibata, 1952 *†''

Echinarachnius subtumidus ''Echinarachnius'' is a genus of sand dollars, belonging to the family Echinarachniidae . Kroh, A.; Mooi, R. (2020). World Echinoidea Database. Echinarachnius Gray, 1825. Accessed through: World Register of Marine Species at: http://www.marines ...

'' Nisiyama & Hashimoto, 1950

References

External links

J.E. (1825). An attempt to divide the Echinida, or Sea Eggs, into natural families. Annals of Philosophy, new series. 10:423-431

Pomel, A. 1883. Classification méthodique et Genera des Échinides vivantes et fossiles. Thèses présentées à la Faculté des Sciences de Paris pour obtenir le Grade de Docteur ès Sciences Naturelles 503, Adolphe Jourdan, Alger, 131 pp

Neave, Sheffield Airey. (1939-1996). Nomenclator Zoologicus vol. 1-10 Online. [developed by uBio, hosted online at MBLWHOI Library
Clypeasteroida Echinoidea genera {{echinoidea-stub