Echinarachniidae is a family of
echinoderm
An echinoderm () is any member of the phylum Echinodermata (). The adults are recognisable by their (usually five-point) radial symmetry, and include starfish, brittle stars, sea urchins, sand dollars, and sea cucumbers, as well as the sea ...
s 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 to the order Clypeasteroida. Some species within the order, not quite as flat, are k ...
.
Genera
Genera:
* ''
Astrodapsis''
Conrad, 1856
* ''
Echinarachnius''
Gray, 1825
* ''
Faassia''
Shmidt, 1971
References
Clypeasteroida
Echinoderm families
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