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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク South American lungfish ： ウィキペディア英語版 South American lungfish The South American lungfish (''Lepidosiren paradoxa'') is the single species of lungfish found in swamps and slow-moving waters of the Amazon, Paraguay, and lower Paraná River basins in South America. Notable as an obligate air-breather, it is the sole member of its family Lepidosirenidae. Relatively little is known about the South American lungfish. Additional common names include American mud-fish〔 page 289〕 and scaly salamanderfish.〔 page 275〕 In Portuguese, it is also known as ((:piɾɐ̃ˈbɔj.jɐ)), ((:piɾɐɾuˈku ˈbɔj.jɐ)), ((:tɾɐˈiɾɐ ˈbɔj.jɐ)), and ((:kɐɾɐmuˈɾu)). The immature lungfish is spotted with gold on a black background; in the adult, this fades to a brown or gray color.〔Animal-world: (South American Lungfish. )〕 Its tooth-bearing premaxillary and maxillary bones are fused as in all Dipnoi. South American lungfish also share an autostylic jaw suspension (where the palatoquadrate is fused to the cranium) and powerful adductor jaw muscles with the extant Dipnoi. Like the African lungfishes, this species has an elongated, almost eel-like body. It may reach a length of .〔 The pectoral fins are thin and thread-like, while the pelvic fins are somewhat larger, and set far back. The fins are connected to the shoulder by a single bone, which is a marked difference from most fish, whose fins usually have at least four bones at their base; and a marked similarity with nearly all land-dwelling vertebrates.〔"Your Inner Fish" Neil Shubin, 2008,2009,Vintage, p.33〕 The gills are greatly reduced and essentially non-functional in the adults. Juvenile lungfish feed on insect larvae and snails, while adults are omnivorous, adding algae and shrimp to their diets, crushing them with their heavily mineralized tooth-plates. The fishes' usual habitats disappear during the dry season, so they burrow into the mud and make a chamber about down, leaving a few holes to the surface for air.〔 During this aestivation, they produce a layer of mucus to seal in moisture, and slow their metabolism down greatly.〔 When the rainy season begins, they come out and begin mating. The parents build a nest for the young, which resemble tadpoles and have four external gills. To enrich the oxygen in the nest, the male develops highly vascularized structures on his pelvic fins that release additional oxygen into the water.〔 The young become air-breathing at about seven weeks. Juveniles have external threadlike gills very much like those of newts.〔 ==References== 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「South American lungfish」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.