翻訳と辞書 Words near each other ・ African black duck ・ African black shrew ・ African black swift ・ African blackwood dermatitis ・ African Blood Brotherhood ・ African blue basil ・ African blue flycatcher ・ African blue tit ・ African blues ・ African Blues (Ali Farka Touré album) ・ African Blues (compilation album) ・ African blues (disambiguation) ・ African Book Publishing Record ・ African Boxing Union ・ African broadbill ・ African brown knifefish ・ African brush-tailed porcupine ・ African buffalo ・ African bullfrog ・ African bullhead ・ African Burial Ground National Monument ・ African bush elephant ・ African bush squirrel ・ African Business ・ African butter catfish ・ African butterflyfish ・ African Capacity for Immediate Response to Crises ・ African Carom Confederation ・ African carp ・ African cassava mosaic virus Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク African brown knifefish ： ウィキペディア英語版 African brown knifefish The African brown knifefish or African knifefish, ''Xenomystus nigri'', is the only species in the genus ''Xenomystus'' of the family Notopteridae. This fish is found in the Chad, Nile, Congo, Ogowe and Niger basins, as well as coastal river basins in Sierra Leone, Liberia, Togo, Benin and Cameroon.〔 ==Anatomy and appearance== This fish reaches 30 cm (12 in) in length. The body of these fish is unusual; it is ventrolaterally flattened and elongated, giving the appearance of a knife blade. The caudal and anal fins are fused and run from beneath the gill opening to the pointed end of the body, creating a uniform, skirt-like fin. This appendage gives the animal superior control in the water, as it is able to propel itself forward and backward with a minimum of wasted energy. The pelvic fins are extremely reduced and are not used in locomotion. The dorsal fin is absent. The pectoral fins of the African brown knifefish are lengthy and designed to give the animal precise control as it swims. They are often employed in a windmilling motion, in conjunction with the caudal/anal fin, as the fish retreats into its lair. The scales of the knifefish are extremely small, giving it a smooth appearance broken only by its fairly prominent lateral line. Apart from its eyes, the lateral line is the knifefish's most important sensory apparatus. The African brown knifefish is nocturnal and uses the nerve-filled pits running down its body to navigate lightless waters. In addition, the eyes of this fish are large in relation to its body size. They provide the animal with excellent night vision. The mouth is large, and the fish also possesses a pair of short barbels used in hunting. The knifefish, when not hiding away, spends much of its time swimming with its head down and the barbels in close proximity to the substrate. Combined with its acute eyes, the barbels aid the fish in locating its food. 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「African brown knifefish」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.