Urechinidae 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
Holasteroida
Holasteroida is an order of irregular sea urchins.
Characteristics
These irregular sea urchins are characterized by a particularly marked bilateral symmetry, including for the apical system, which is highly elongated. In some contemporary ab ...
.
Genera:
* ''
Antrechinus''
Mooi & David, 1996
* ''
Cystechinus''
A.Agassiz, 1879
* ''
Pilematechinus''
A.Agassiz, 1904
* ''
Urechinus''
A.Agassiz, 1879
References
Holasteroida
Echinoderm families
{{echinoidea-stub