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Following injury by a non-venomous sea urchin, the spine can stay for a while inside the flesh, causing pain and discomfort. Spines not dissolved or expelled from the body may eventually be surrounded by a granuloma, a normal inflammatory reaction that forms a nodule around foreign bodies.
Sea urchins move by walking, using their many flexible tube feet in a way similar to that of starfish; regular sea urchins do not have any favourite walking direction. [13] The tube feet protrude through pairs of pores in the test, and are operated by a water vascular system ; this works through hydraulic pressure , allowing the sea urchin to ...
Toxopneustes pileolus, commonly known as the flower urchin, is a widespread and commonly encountered species of sea urchin from the Indo-West Pacific.It is considered highly dangerous, as it is capable of delivering extremely painful and medically significant stings when touched.
Like other venomous sea urchins, the venom of Diadema setosum is only mild and not at all fatal to humans. The toxin mostly causes swelling and pain, and gradually diffuses over several hours. More danger is presented by the delivery system – the urchin's spines which are extremely brittle and needle-like.
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
The debate rages among scientists as to whether fish do, in fact, feel pain or are just reacting erratically to certain stimuli. ... a Florida sea grant extension agent at the University of ...
Emotional pain is the pain experienced in the absence of physical trauma, e.g. the pain experienced by humans after the loss of a loved one, or the break-up of a relationship. It has been argued that only primates, including humans, can feel "emotional pain".
A mysterious sea urchin plague has spread across the world, causing the near extinction of the creature in some areas and threatening delicate coral reef ecosystems, a new study suggests.