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Talitrus saltator : ウィキペディア英語版 | Talitrus saltator
''Talitrus saltator'', a species of sand hopper, is a common amphipod crustacean of sandy coasts around Europe. The animal's typical "hopping" movement gives the animal its common name, and is produced by a flexion of the abdomen.〔 In order to do this, it must stand on its legs (amphipods usually rest on their sides) and suddenly extend its abdomen out from under its body.〔 It can thus leap several inches into the air,〔(【引用サイトリンク】title=Sand-hopper )〕 although without any control over its direction.〔 A great deal of scientific research has been carried out on the animal, to determine the environmental cues it uses to control its behaviour.〔 ==Description== ''Talitrus saltator'' reaches lengths between and , with males being slightly larger than females. The body is greyish-brown or greyish-green in colour,〔〔(【引用サイトリンク】title=Sand hopper (''Talitrus saltator'') )〕 with a single pair of black eyes. It has a distinct pair of antennae, with one antenna more robust than the other.〔
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