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Selachii (order) (Elasmobranchii (subclass), Chondrichthyes (class), ... Living Organisms (hierarchy name)) |
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Note: Members of an order containing 400 living species and many fossil species of predatory, cartilaginous fishes that have a fusiform shape and gill cleft location on either side of the head resembling bony fishes; most having a tough skin that is dull gray in color and roughened by toothlike scales; a muscular, asymmetrical, upturned tail and pointed fins; a pointed snout extending forward and over a crescentic mouth set with sharp triangular teeth; and a lack of a swim bladder requiring the animals to swim nearly perpetually to keep from sinking to the bottom. A few of the larger species are able to maintain their body temperature above the surrounding water temperature, although they are not truly warm blooded. Sharks developed as long ago as 450 million years ago. Some classifications place sharks in the superorder Selachimorpha.
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| Terms: |
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| Selachii (order) (preferred,C,U,English-P,D,U,N)
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| Selachii (order) (Latin-P,D,U,N)
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| sharks (C,U,LC,English,AD,U,N)
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| shark (C,U,English,AD,U,N)
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| 鯊目 (目) (C,U,Chinese (traditional)-P,D,U,U)
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| 軟骨鯊目 (C,U,Chinese (traditional),UF,U,U)
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| 鯊 (C,U,Chinese (traditional),UF,U,U)
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| 鯊魚 (C,U,Chinese (traditional),UF,U,U)
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| shā mù (C,U,Chinese (transliterated Hanyu Pinyin)-P,UF,U,U)
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| sha mu (C,U,Chinese (transliterated Wade-Giles),UF,U,U)
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| sha mu (Chinese (transliterated Pinyin without tones)-P,UF,U,U)
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| Selachimorpha (superorder) (C,U,Latin,UF,U,N)
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Facet/Hierarchy Code: H.HL |
Hierarchical Position:
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Agents Facet |
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.... Living Organisms (hierarchy name) (G) |
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........ living organisms (entities) (G) |
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............ Eukaryota (domain) (G) |
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................ Animalia (kingdom) (G) |
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.................... Chordata (phylum) (G) |
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........................ Vertebrata (subphylum) (G) |
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............................ Chondrichthyes (class) (G) |
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................................ Elasmobranchii (subclass) (G) |
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.................................... Selachii (order) (G) |
Additional Notes: |
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| Chinese (traditional) ..... 含四百種現存物種及許多已滅絕物種。鯊目屬食肉性軟骨魚類，體呈流線型；牠們與硬骨魚類似，鰓裂皆位於頭部兩側；大多數鯊目魚類的皮膚堅韌，呈暗灰色，因佈滿齒狀鱗片而顯粗糙；鰭形尖突，健壯的尾鰭不對稱且上揚；吻部尖突且向前延伸，下方的魚嘴呈新月狀，嘴內具三角形銳齒；鯊目魚類沒有魚鰾，因此必須不斷游動，以避免沉到水底。雖然鯊目魚類並非真正的恆溫動物，但是少數大型魚種能夠維持高於水溫的體溫。四億五千萬年前即有鯊魚，並且演化至今。某些分類法將鯊魚列入鯊總目。 |
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Related concepts: |
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| source for .... |
shark teeth |
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(teeth (animal components), animal components, ... Components (hierarchy name)) [300379302] |
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Sources and Contributors: |
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