Cidaridae
Temporal range: Lower Permian–Recent
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Cidaris cidaris MHNT.jpg
Cidaris cidaris
Scientific classification
Kingdom:
Animalia
Phylum:
Echinodermata
Class:
Echinoidea
Subclass:
Perischoechinoidea
Order:
Cidaroida
Family:
Cidaridae

Gray, 1825
Genera

See text

Cidaridae is a family of sea urchins in the order Cidaroida.

Description and characteristics

Typical test of a cidarid sea urchin (Phyllacanthus imperialis).

Cidarid sea urchins are characterized by their stout skeletton : the test is thick and hard, with massive perforated tubercles (never crenulated) surrounded by a crown of secondary tubercles, but no primary tubercles in the interambulacra regions. These tubercles hold massive spines, thick, strong and often very long, and showing sometimes odd shapes (thorny spines, fans, clubs, Christmas trees...) · .

The order Cidaroida is the basalmost of current sea urchins, and most of the species included in this family are abyssal, even if a handful of species remain quite common in tropical shallow waters, like Eucidaris or Phyllacanthus .

Genera

Primary spines from the family Cidaridae

According to the World Register of Marine Species (WoRMS), the following genera are included in this family

A now abandoned genus, Cidarites was used in the late 18th and early 19th century to describe a number of species of both cidarid and echid sea urchins.


This article uses material from the Wikipedia article Cidaridae, which is released under the Creative Commons Attribution-Share-Alike License 3.0.