How To Use Agnatha In A Sentence
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Modern vertebrates are classified into two major groups, the gnathostomes (jawed vertebrates) and the agnathans (jawless vertebrates).
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Notochords are the axial skeleton of invertebrate chordates (cephalochordates, appendicularians, and tadpole larvae of ascidians), of agnathan fish, and of amphibian tadpoles.
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There is also considerable scope for informed speculation about the feeding mechanisms among the extinct agnathans.
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The hagfish, together with lampreys, are living representatives of the jawless vertebrates (class Agnatha) and are considered to be the most evolutionarily ancient vertebrates.
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One landmark event in vertebrate evolution was the evolution of jaws from agnathan ancestors, which was followed by the first appearance of the stomach.
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The hagfish, together with lampreys, are living representatives of the jawless vertebrates (class Agnatha) and are considered to be the most evolutionarily ancient vertebrates.
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Above all, the appearance of diverse chordates and agnathans greatly expands our knowledge of the Cambrian explosion.
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Related agnathans with external armour occur widely from the Late Silurian to the Devonian, but they all became extinct before the start of the Carboniferous.
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During this period the agnathan and gnathostome fishes, too, gave rise to many distinctive groups: the armoured ostracoderm and placoderms, the bony fishes, and elasmobranchs to populate marine and freshwater environments.
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Although a small number of bony fishes have brains of the same relative size as those in agnathans, most bony fishes have considerably larger brains for the same body size.
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Agnathans generally have the smallest brains for their body size, with hagfishes having brains that are two to three times larger than lampreys of the same body size.
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Prototypic T cell receptor and CD4-like coreceptor are expressed by lymphocytes in the agnathan sea lamprey.
Stuck on you, biological Velcro and the evolution of adaptive immunity - The Panda's Thumb
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There is also considerable scope for informed speculation about the feeding mechanisms among the extinct agnathans.
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In traditional classifications, the hagfish, lampreys, and extinct armored jawless fish are grouped together in the paraphyletic Class Agnatha.
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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.
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Related agnathans with external armour occur widely from the Late Silurian to the Devonian, but they all became extinct before the start of the Carboniferous.