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词汇 Rajiformes
分类 英语词汇 英语翻译词典
释义

Rajiformes

中文百科

鳐目

鳐目(学名Rajiflumes)又名魮鲪目是一群身体浑圆的软骨鱼,属于板鳃类,在型态上和鲨鱼很接近,尤其和鼠鲨目更接近,因此和鲨同属于一类,鳐一般在海中栖息,滤食浮游生物,口和鳃裂都是腹位,只有少数种类是在在淡水中生活或底栖,臀鳍大,胸鳍消失,以浮游生物和甲壳类为食物,体形差异相当大,大的有几米长,小的只有几厘米,也有可以作为宠物饲养的品种。除了能发电的电鳐目单独分出以外,鳐目的鱼可以分为14个科,是板鳃类中最大的目。

英语百科

Rajiformes 鳐目

Dasyatis pastinaca, the common stingray
Mobula mobular, the devilfish
Raja texana, the roundel skate

Rajiformes is one of the four orders in the superorder Batoidea, flattened cartilaginous fishes related to sharks. Rajiforms are distinguished by the presence of greatly enlarged pectoral fins, which reach as far forward as the sides of the head, with a generally flattened body. The undulatory pectoral fin motion diagnostic to this taxon is known as rajiform locomotion. The eyes and spiracles are located on the upper surface of the head and the gill slits are on the underside of the body. Most species give birth to live young, although some lay eggs with a horny capsule ("mermaid's purse").

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