Echinarachnius

Echinarachnius is a genus of sand dollars, belonging to the family Echinarachniidae . ^[1]

Echinarachnius
Echnarachnius parma
Scientific classification
Kingdom:	Animalia
Phylum:	Echinodermata
Class:	Echinoidea
Superorder:	Gnathostomata
Order:	Clypeasteroida
Family:	Echinarachniidae
Genus:	Echinarachnius Gray, 1825
Synonyms
Echinarachinus (misspelling) Echinarachnius (Echinarachnius) Gray, 1825 (subgeneric subdivision not accepted by scientific community) Phelsumaster Lambert & Thiéry, 1914 (objective junior synonym) Phelsumia Pomel, 1883 (junior homonym of Phelsumia Gray, 1840 (Reptilia))

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 (Lamarck, 1816)
• †Echinarachnius rumoensis Hayasaka & Shibata, 1952
• †Echinarachnius subtumidus Nisiyama & Hashimoto, 1950