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Sea urchins or urchins (/ ˈ ɜːr tʃ ɪ n z /) are typically spiny, globular animals, echinoderms in the class Echinoidea. About 950 species live on the seabed, inhabiting all oceans and depth zones from the intertidal to 5,000 metres (16,000 ft; 2,700 fathoms). [1]
Sea urchins tend to be important members of their ecosystems by grazing on other organisms and stabilizing populations. In addition to this, sea urchins play a large role in different economies globally as the urchin themselves and their roe are sold for consumption. [1] The same is true for the species within the genus Echinus. [2]
Scientific classification; ... Phylum: Echinodermata: Class: Echinoidea: Subclass: ... The subclass Euechinoidea includes almost all living species of sea urchin, ...
Tripneustes ventricosus, commonly called the West Indian sea egg or white sea urchin, is a species of sea urchin. It is common in the Caribbean Sea , the Bahamas and Florida and may be found at depths of less than 10 metres (33 ft).
The red sea urchin (Mesocentrotus franciscanus) [1] is a sea urchin found in the northeastern Pacific Ocean from Alaska to Baja California.It lives in shallow waters from the low-tide line to greater than 280 m (920 ft) deep, [2] and is typically found on rocky shores sheltered from extreme wave action in areas where kelp is available.
The melon sea urchin (Echinus melo) in northwest Sardinia: Scientific classification; Domain: Eukaryota: Kingdom: Animalia: Phylum: Echinodermata: Subphylum: Echinozoa: Classes Echinoidea (sea urchins) Holothuroidea (sea cucumbers) †Ophiocistioidea † = Extinct
Echinometra mathaei grows to a test diameter of about 5 centimetres (2.0 in). The colour is quite variable but the test is usually a dark colour. The spines are sometimes green and purple with purple tips or entirely green with purple tips but this sea urchin can be distinguished from other species by a characteristic pale ring at the base of each spine.
Eucidaris tribuloides, the slate pencil urchin (named after slate pencil), is a species of cidaroid sea urchins that inhabits littoral regions of the Atlantic Ocean. As a member of the basal echinoid order Cidaroida , its morphological, developmental and molecular genetic characteristics make it a phylogenetically interesting species.