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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.
[4] [1] The injury may show small purple or black dots or staining of the skin from the natural dye inside the sea urchin. [4] [1] These symptoms generally subside with complete removal of the spines. [4] About 80 of the 600 unique species of sea urchins contain poisons, but they generally do not cause significant harm to humans. [5]
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 ...
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
For marine scientists, it was deja vu: Another die-off swept through the region in the 1980s and slashed sea urchin populations by around 98%. Mystery solved: Scientists ID Caribbean sea urchin killer
These days, long-spined sea urchins are known as the gardeners of the sea. They tend the algae on the coral reefs they call home, making sure it never overwhelms their hosts. Spotting one on the ...
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
It is a typical sea urchin, with extremely long, hollow spines that are mildly venomous. D. setosum differs from other Diadema with five, characteristic white dots that can be found on its body. The species can be found throughout the Indo-Pacific region, from Australia and Africa to Japan and the Red Sea. Despite being capable of causing ...