The subclass Euechinoidea includes almost all living species of
sea urchin
Sea urchins or urchins () are echinoderms in the class (biology), class Echinoidea. About 950 species live on the seabed, inhabiting all oceans and depth zones from the intertidal zone to deep seas of . They typically have a globular body cove ...
, with fossil forms going back as far as the
Triassic
The Triassic ( ; sometimes symbolized 🝈) is a geologic period and system which spans 50.5 million years from the end of the Permian Period 251.902 million years ago ( Mya), to the beginning of the Jurassic Period 201.4 Mya. The Triassic is t ...
.
Taxonomy
List of orders according to
World Register of Marine Species
The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive catalogue and list of names of marine organisms.
Content
The content of the registry is edited and maintained by scien ...
Echinacea
''Echinacea'' is a genus of herbaceous flowering plants in the daisy family. It has ten species, which are commonly called coneflowers. They are native only in eastern and central North America, where they grow in wet to dry prairies and open ...
Camarodonta
The Camarodonta are an Order (biology), order of globular sea urchins in the class (biology), class Echinoidea. The fossil record shows that camarodonts have been in existence since the Lower Cretaceous.Salenioida
*** Order
Stomopneustoida
Stomopneustoida is an order of echinoderms belonging to the class Echinoidea.
Families:
* Glyptocidaridae
* Stomechinidae
* Stomopneustidae
References
Echinoidea
Echinoderm orders
{{echinoidea-stub ...
Clypeasteroida
Sand dollars (also known as sea cookies or snapper biscuits in New Zealand and Brazil, or pansy shells in South Africa) are species of flat, burrowing sea urchins belonging to the Order (biology), order Clypeasteroida. Some species within the or ...