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''Hymenocera picta'', commonly known as the harlequin shrimp, is a species of saltwater shrimp found at coral reefs in the tropical Indian and Pacific oceans. It is usually considered the only species in the genus ''Hymenocera'', but some split it into two species: ''H. picta'' from the central and east Pacific where the spots are deep pinkish-purple with a yellow edge, and ''H. elegans'' from the Indian Ocean and west Pacific where the spots are more brownish and have a blue edge.〔Debelius, H. (2001). ''Crustacea: Guide to the World.'' Pp. 198-199. ISBN 978-3-931702-74-8〕 They reach about in length, live in pairs and feed exclusively on starfish,〔 including crown-of-thorns starfish. It does seem to prefer smaller, more sedentary starfish, but as these generally are not sufficiently numerous for its needs, it commonly will attack ''Acanthaster'', both reducing its consumption of coral while under attack, and killing it within a few days.〔Glynn, P.W., Interactions between Acanthaster and Hymenocera in the field and laboratory. In: D.L. Taylor (ed.) Proceedings of Third International Coral Reef Symposium Vol. 1: Biology. Rosenstiel School of Marine and Atmospheric Science, Miami, Florida. pp. 209-216. 1977〕 ==Description== The Hymenocera, or Harlequin shrimp, is usually cream colored or white with occasional spots. Around the Pacific Ocean, many of these shrimp will have red spots while the Indian Ocean shrimp typically have purple spots while its close cousin, the Hawaiian H. picta, has purple and red spots off of their body, the shrimp have two walking legs on each side and large claws, or cheliped. The claws and eyes appear to look flattened and thin. On its head the shrimp have "petal-like sensory antennules" to smell out their prey. Their body usually reaches up to 5 cm or 2 inches, and the male is just a little bit smaller than the female.〔(of Hawaii Mãnoa Education Department. "Marine Life Profile: Harlequin Shrimp." Waikiki Aquarium, n.d. Web Image:Hymenocera picta.jpg | Couple of ''Hymenocera picta'' hunting a sea star. Image:Harlequin Shrimp 1.jpg | Harlequin shrimp of Indian Ocean/West Pacific population Image:Hymenocera picta55.jpg Image:Harlequin Shrimps - Hymenocera Elegans.jpg 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hymenocera」の詳細全文を読む スポンサード リンク
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