圆口纲 Cyclostomata
（重定向自Marsipobranchii）
圆口纲（Cyclostomata）是在动物分类学上提出的一种分类，与已经灭绝的甲胄鱼类（Ostracoderms）同位于无颔总纲（Agnatha）之下。现存代表动物为七鳃鳗（又名：八目鳗）。
Marsipobranchii
/ˌmɑ:səpəu'bræŋkii/
英汉-汉英词典
囊鳃类
词组 | 习惯用语
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- bronchiolitis n. 细支气管炎
网络短语:
Marsipobranchii 囊鳃类; 囊腮类;
中文百科
英语百科
Cyclostomata 圆口纲
（重定向自Marsipobranchii）
Cyclostomata is a group of chordates that comprises the living jawless fishes: the lampreys and hagfishes. Both groups have round mouths that lack jaws but have retractable horny teeth. The name Cyclostomata means "round mouths". Their mouths cannot close due to the lack of a jaw, so they have to constantly cycle water through the mouth.
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