''Echinarachnius'' is a genus of

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

s, belonging to the family

Echinarachniidae Echinarachniidae is a family of echinoderms belonging to the order Clypeasteroida Sand dollars (also known as a sea cookie or snapper biscuit in New Zealand, or pansy shell in South Africa) are species of flat, burrowing sea urchins belonging ...

. 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 in the geologic time scale that extends from 5.333 million 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 ''Echinarachnius parma'', the common sand dollar, is a species of sand dollar native to the Northern Hemisphere. Kroh, A.; Mooi, R. (2020). World Echinoidea Database. Echinarachnius parma (Lamarck, 1816). Accessed through: World Register of Mari ...

'' (Lamarck, 1816) *†'' Echinarachnius rumoensis'' Hayasaka & Shibata, 1952 *†'' Echinarachnius subtumidus'' 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