Agnatha (/ ˈæɡnəθə, æɡˈneɪθə /; [3] from Ancient Greek ἀ- (a-) 'without' and γνάθος (gnáthos) 'jaws') or jawless fish is a paraphyletic infraphylum [4] of animals in the subphylum Vertebrata …

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2025年3月1日 · 研究 jawless （无颌的）物种帮助科学家理解脊椎动物如何随着时间的推移而适应，以及进化可能采取的多种途径。 总之， jawless 动物代表了脊椎动物家族树的一个独特而古 …

2019年9月2日 · Agnatha or jawless fish - Characteristics and examples. Agnata are fish characterized by an absence of jaws. For more about what is agnatha are jawless fish …

Having no jaws or lacking a jaw...。 点击查看英语发音、例句和视频。

Jawless fishes or agnathans are craniates that represent an ancient vertebrate lineage that arose over one half-billion years ago. “Gnathos” is Greek for “jaw” and the prefix “a” means “without,” …

2024年7月9日 · Jawless fish, belonging to the infraphylum Agnatha, are unique among vertebrates due to their lack of jaws. They possess long, cylindrical bodies devoid of paired …

Jawless fishes (Agnatha) are craniates representing an ancient vertebrate lineage that arose over 550 million years ago. In the past, hagfishes and lampreys were sometimes recognized as …

1. noun An impudent answer or response; back talk. A: "Tommy, please clean your room." B: "Go clean it yourself!" A: "Give me jaw like that again and I'll tan your hide!" 2. noun Idle …

2024年4月12日 · The Agnatha, meaning “without jaws,” is a superclass of jawless fish within the phylum Chordata and subphylum Vertebrata. It encompasses both living species, known as …