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Diadema setosum
''Diadema setosum'' is a species of long-spined sea urchin belonging to the family Diadematidae. 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 painful stings when stepped upon, the urchin is only slightly venomous and does not pose a serious threat to humans.
==Description==
As a member of the class Echinoidea, the anatomy of ''Diadema setosum'' is that of a typical sea urchin. All of the animal's internal organs are enclosed within the spherical, black test that is essentially the body of the organism. However, the body is not perfectly spherical – ''Diadema'' tests are slightly dorso-ventrally compressed. Protruding outwards from the central body are the long spines iconic of a sea urchin's appearance. Like the other members of the family Diadematidae, the spines of ''D. setosum'' are extremely long and narrow in proportion to its body. The spines, often black but sometimes brown-banded, are hollow and contain a mild venom. ''D. setosum'' can be distinguished from other species in the genus ''Diadema'' by the presence of five white spots on the animal's test, strategically located between the urchin's ambulacral grooves.
In addition, a clear distinguishing characteristic of the species is the presence of a bright, orange ring around the urchin's periproctal cone, a structure commonly referred to as the urchin's "anus". A few other minor characteristics in ''D. setosum'' include bluish spots on the organism's genital plates and similar blue spots (iridophores) arranged in linear fashion along its test. An apical ring is absent in the species, along with calcareous platelets on its apical cone.〔 Sexually mature ''Diadema setosum'' specimens average from 35 to 80 grams in weight.〔 Adults average a size of no more than 70 millemeters in test diameter and around 40 millemeters high.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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