'Cyclostomes'这个词源于希腊语，意思是“圆口动物”。它是一个分类学上的术语，指的是一类没有颌骨的鱼类（如海鳞鱼、七鳃鳗等），它们的嘴巴周围有一个环形的口腔，可以吸食食物。
以下是9个含有'Cyclostomes'的例句：
1. Cyclostomes are primitive agnathans that are characterized by a circular mouth without a jaw.
（Cyclostomes是原始的无颌鱼类，其特征为没有颌的圆形口。）
2. With the rejection of the monophyly of cyclostomes, traditional hypotheses of vertebrate origins undoubtedly require revision.
（随着对Cyclostomes的单系群的拒绝，脊椎动物起源的传统假说无疑需要修订。）
3. The cyclostomes are usually freshly caught and processed, but they can be stored whole or in parts frozen in air in refrigerated storage for several months.
（Cyclostomes通常是新鲜捕捞和加工的，但它们可以整体或部分冷冻存储在冷藏库的空气中，可保存数月。）
4. The shift from cyclostomes to gnathostomes (jawed vertebrates) represents one of the major transitions in vertebrate evolution.
（从Cyclostomes到颌下动物（有颌脊椎动物）的转变代表了脊椎动物进化中的一个主要转变。）
5. The phylogenetic position of cyclostomes is a hotly debated topic among evolutionary biologists.
（Cyclostomes的系统发育位置是进化生物学家们热烈争论的话题。）
6. Lampreys are the only living representatives of the ancient group of fish known as cyclostomes.
（七鳃鳗是已知的能代表Cyclostomes的唯一现代鱼类。）
7. In comparison with cyclostomes, gnathostomes possess a more complex immune system.
（相比Cyclostomes，颌下动物拥有更复杂的免疫系统。）
8. Cyclostomes are characterized by cartilaginous skulls and a lack of paired appendages.
（Cyclostomes的特征是软骨头骨和缺乏成对附肢。）
9. The discovery of a 500-million-year-old chordate that may have evolved into cyclostomes suggests that these animals have a deep evolutionary history.
（发现了一个可能进化成为Cyclostomes的5亿年前的脊索动物，表明这些动物具有深刻的演化史。）
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