英语词汇“Agnatha”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

Agnatha

/aɡˈneɪθə

plural noun Zoology

A group of primitive jawless vertebrates which includes the lampreys, hagfishes, and many fossil fishlike forms. Compare with cyclostome.

Superclass Agnatha: the living forms are in the classes Myxini (hagfishes) and Cephalaspidomorphi (lampreys).

Here, we use the sequences of 35 nuclear protein-encoding genes to provide definitive evidence for the monophyly of the Agnatha (jawless vertebrates, a group encompassing the hagfishes and lampreys)....

The earliest fossil vertebrates belong to a group called the Agnatha or jawless vertebrates.
In modern classification schemes, living vertebrates consist of two main groups, the jawless Agnatha (represented by hagfishes and lampreys) and the jawed Gnathostomata.

Derivatives

agnathan

noun & adjective ...

Modern vertebrates are classified into two major groups, the gnathostomes (jawed vertebrates) and the agnathans (jawless vertebrates).
Above all, the appearance of diverse chordates and agnathans greatly expands our knowledge of the Cambrian explosion.
Sufficient articulated material exists to show that these animals were agnathans (jawless vertebrates), with a bony exoskeleton, and they appear to have inhabited shallow-marine environments.

Origin

From modern Latin Agnatha, from a-¹ 'without' + Greek gnathos 'jaw'.

单词	Agnatha
释义	Agnatha /aɡˈneɪθə / plural noun Zoology A group of primitive jawless vertebrates which includes the lampreys, hagfishes, and many fossil fishlike forms. Compare with cyclostome. Superclass Agnatha: the living forms are in the classes Myxini (hagfishes) and Cephalaspidomorphi (lampreys). Here, we use the sequences of 35 nuclear protein-encoding genes to provide definitive evidence for the monophyly of the Agnatha (jawless vertebrates, a group encompassing the hagfishes and lampreys).... The earliest fossil vertebrates belong to a group called the Agnatha or jawless vertebrates. In modern classification schemes, living vertebrates consist of two main groups, the jawless Agnatha (represented by hagfishes and lampreys) and the jawed Gnathostomata. Derivatives agnathan noun & adjective ... Modern vertebrates are classified into two major groups, the gnathostomes (jawed vertebrates) and the agnathans (jawless vertebrates). Above all, the appearance of diverse chordates and agnathans greatly expands our knowledge of the Cambrian explosion. Sufficient articulated material exists to show that these animals were agnathans (jawless vertebrates), with a bony exoskeleton, and they appear to have inhabited shallow-marine environments. Origin From modern Latin Agnatha, from a-¹ 'without' + Greek gnathos 'jaw'.
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