軟骨魚綱
Multi tool use
软骨鱼纲
化石时期：422–0 Ma[1][2]
PreЄ
Є
O
S
D
C
P
T
J
K
Pg
N
晚志留纪－現代
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大白鯊(Carcharodon carcharias)
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科学分类 
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| 界： |
动物界 Animalia
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| 门： |
脊索动物门 Chordata
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| 演化支： |
嗅球类 Olfactores
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| 演化支： |
有头动物 Craniata
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| 亚门： |
脊椎动物亚门 Vertebrata
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| 下门： |
有颔下门 Gnathostomata
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| 小门： |
真有颔小门 Eugnathostomata
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| 纲： |
软骨鱼纲 Chondrichthyes
Huxley, 1880
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亞綱
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板鰓亞綱 Elasmobranchii
全頭亞綱 Holocephali
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软骨鱼类是一种古老的鱼类，进化自盾皮鱼。软骨鱼类是鱼类中最低等的类群，除了牙齿为硬骨外，骨骼全部由软骨组成，体被盾鳞或无鳞；鳃裂每侧5－7个分别开口于体外，或4个外被一膜质鳃盖；雄性的腹鳍里侧具有鳍脚；尾鳍呈歪尾型；肠具有螺旋瓣；无鳔；具有鰓
裂；软骨鱼类的生殖方式是体内受精，卵生、卵胎生或胎生。
軟骨魚绝大多数在海洋中生活，但它们却起源于淡水生活的祖先。
进化
软骨鱼和硬骨鱼，一起出现在泥盆纪，它们不断进化，最后取代了盾皮鱼类。现存的2万多种鱼类中，根据其骨骼的性质，可分为软骨鱼和硬骨鱼两大类。
分类
现存的软骨鱼类主要分为板鳃亚纲和全头亚纲（银鲛）两个亚纲。其中板鳃亚纲包括鲨鱼、魟、鳐、锯鳐等。
参见
参考文献
^ Botella, H.A.; Donoghue, P.C.J.; Martínez-Pérez, C. Enameloid microstructure in the oldest known chondrichthyan teeth. Acta Zoologica. 2009, 90 (Supplement): 103–108 [26 November 2013]. doi:10.1111/j.1463-6395.2008.00337.x.
^ Chondrichthyes. PalaeoDB. [26 November 2013].
按亞門與綱分類的現存脊索動物
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- 界: 動物界
- 亞界: 真后生动物
- （未分级）: 两侧对称动物
- 超門: 後口動物總門＞脊索動物門
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| 尾索動物亞門 |
海鞘綱、樽海鞘纲、尾海鞘綱、深水海鞘綱
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| 頭索動物亞門 |
頭索綱 |
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| 脊椎動物亞門 |
無頜總綱 |
盲鰻綱、七鰓鰻綱
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有頜下門 |
軟骨魚 |
軟骨魚綱 |
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硬骨魚 |
輻鰭魚、肉鰭魚
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四足總綱 |
羊膜動物 |
哺乳綱
蜥形綱 |
傳統爬蟲類（喙頭蜥目 + 有鱗目 + 龜鱉目 + 鱷目）、鳥綱
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| 物種識別信息 |
- 維基數據: Q25371
- 維基物種: Chondrichthyes
- ADW: Chondrichthyes
- EoL: 2774522
- EPPO: 1CHONC
- Fossilworks: 34422
- iNaturalist: 196614
- IRMNG: 1155
- ITIS: 159785
- NCBI: 7777
- NZOR: 4acd6aba-2825-45a9-8143-ae4486ceeeb7
- uBio: 179479
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