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This species is a large sea urchin, crapping in some specimens reaching over 8 cm in diameter, with spikes up to 10 cm. Most specimens are bright red, but brown and purple colorations are also seen. [3] The spines may have a different color from the body. Spines have a white ring at their stem and have alternating light and dark rings.
Close-up of Asthenosoma varium, showing distinctive spines. Asthenosoma varium is a large sea urchin, hemispherical in shape, and growing to a diameter of 25 cm (10 in). ). The plates from which the test is formed are not joined rigidly together, as is the case in most sea urchin
Diadema paucispinum is a small sea urchin with very long, moveable spines which are slender and sharply pointed. They can be up to 25 cm (10 in) long and about four times the diameter of the test. The primary spines are bluish-black in colour, often with pale bands in younger individuals.
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 ...
Diadema savignyi is a species of long-spined sea urchin belonging to the family Diadematidae. Common names include long-spined sea urchin , black longspine urchin and the banded diadem . It is native to the east coast of Africa, the Red Sea, the Indian Ocean and western Pacific Ocean.
Heterocentrotus are brightly colored tropical sea urchins with very thick spines that have given them the nickname "slate pencil urchins", named after slate pencil.. The genus consists of sea urchins with rounded (but slightly elliptical) test , with the peristome (mouth) located in the center of the oral surface (lower) and the periproct at ...
Expert warns urchins vital to coral reef ecosystems now ‘functionally extinct’ in Red Sea Mysterious plague is wiping out sea urchins across the globe, scientists say Skip to main content
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 ...
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