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Sterechinus
''Sterechinus'' is a genus of sea urchins in the family Echinidae. All living members of the genus are found in the waters around Antarctica but the first species described in the genus was a fossil and was found in Europe.
==Description==
Members of the genus ''Sterechinus'' have compound ambulacral plates that are trigeminate (composed of three elements). These plates have a primary tubercle articulating with a spine on the middle element, a small secondary tubercle in the interambulacral groove on one side of it and 3 pairs of pores on the other. The tube feet are connected to these pores in the living animal and the pore pairs are arranged in a vertical arc. The sutures between the plates are deeply indented. The area of narrow plates around the mouth is small and the buccal notches are shallowly grooved.〔(''Stirechinus'' Desor, 1856 ) The Natural History Museum. Retrieved 2012-01-09.〕
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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