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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').
The Antarctic sea urchin ranges in color from bright red to dull purple and can grow to 5 centimetres (2.0 in) in diameter. The test is globular with vertical rows of long, strong, white-tipped spines between which there is a dense covering of smaller spines and vertical rows of tube feet.
Mespilia globulus, the globular sea urchin, sphere sea urchin, or tuxedo urchin (trade name), is a sea urchin occurring in tropical shallow reef habitats. [1] The specific name refers to a small ball or spherule, describing its overall shape/morphology. [1] It is the only species in the genus Mespilia. [2]
The Diadematidae are a family of sea urchins. Their tests are either rigid or flexible and their spines are long and hollow. [2] Astropyga Gray, 1825 Astropyga radiata (Leske, 1778), extant; Astropyga pulvinata (Lamarck, 1816), extant; Astropyga magnifica (Clark, 1934), extant; Centrostephanus Peters, 1855 Centrostephanus asteriscus (Agassiz ...
Its range extends from the Mediterranean Sea and North African coast to the Caribbean Sea and the Gulf of Mexico. [1] The depth range is between 40 and 210 metres (130 and 690 ft). Off Florida this urchin is usually found on algae or on broken coral substrates , particularly the rubble remains of dead ivory bush coral ( Oculina varicosa ).
Cidaroida, [1] also known as pencil urchins, [2] is an order of primitive sea urchins, the only living order of the subclass Perischoechinoidea.All other orders of this subclass, which were even more primitive than the living forms, became extinct during the Mesozoic.
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).
These tubercles hold massive spines, thick, strong and often very long, and showing sometimes odd shapes (thorny spines, fans, clubs, Christmas trees [1]...). [ 2 ] [ 3 ] 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 ...