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The name urchin is an old word for hedgehog, which sea urchins resemble; they have archaically been called sea hedgehogs. [6] [7] The name is derived from the Old French herichun, from Latin ericius ('hedgehog'). [8] Like other echinoderms, sea urchin early larvae have bilateral symmetry, [9] but they develop five-fold symmetry as they mature ...
Sea urchin being cut open to eat its eggs Sea cucumbers as traditional Chinese medicine. In 2019, 129,052 tonnes of echinoderms were harvested. The majority of these were sea cucumbers (59,262 tonnes) and sea urchins (66,341 tonnes). [159] These are used mainly for food, but also in traditional Chinese medicine. [160]
Sterechinus neumayeri, the Antarctic sea urchin, is a species of sea urchin in the family Echinidae. It is found living on the seabed in the waters around Antarctica. It has been used as a model organism in the fields of reproductive biology, embryology, ecology, physiology and toxicology. [2]
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]
Echinacea / ˌ ɛ k ɪ ˈ n eɪ s i ə, ˌ ɛ k ɪ ˈ n eɪ ʃ i ə / [1] is a genus of herbaceous flowering plants in the daisy family.It has ten species, which are commonly called coneflowers. ...
Astropyga radiata, the red urchin, fire urchin, false fire urchin or blue-spotted urchin, is a species of sea urchin in the family Diadematidae. It is a large species with long spines and is found in the tropical Indo-Pacific region. It was first described in 1778 by the German naturalist Nathaniel Gottfried Leske.
Commenting on this suggestion, sea urchin expert F. Julian Fell pointed out that Dermechinus horridus lived in zooplankton-rich waters and that its upright posture resembled that of a filter-feeding sea cucumber; the long spines formed combs and the short spines would be suitable for transporting small particles to the mouth at the base of the ...
The banded sea urchin has a slightly oval test (shell), reaching a diameter of about 5 cm. [1] Like almost all the Diadematidae (but it is in Echinothrix calamaris that it is most obvious) it has two different sets of spines, short and slender closed spines which go from yellow to dark (through brown) in colour and can deliver a nasty sting, and longer and thicker spines that are often banded ...