How To Use Gnathostome 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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Either a basal gnathostome such as a shark or a basal actinopterygian such as a sturgeon would be equally instructive.
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Their presence suggests the feature appeared in a common ancestor of jawed vertebrates, or gnathostomes.
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The symmetrical, diphycercal tail, not perfected by gnathostomes until the Cretaceous, was standard equipment on heterostracans in the Silurian.
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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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The extinct armored fishes known as placoderms make up what is considered to be the earliest branch of the gnathostome family tree - the earliest branch of the jawed fishes.
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Certainly it does not acheive a result more consonant with the accepted gnathostome phylogeny.
Panderichthys rhombolepis - The Panda's Thumb
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The extinct armored fishes known as placoderms make up what is considered to be the earliest branch of the gnathostome family tree - the earliest branch of the jawed fishes.
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In all the Gnathostomes the Wolffian duct is converted into the spermaduct, and the Mullerian duct into the oviduct.
The Evolution of Man — Volume 2
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The extinct armored fishes known as placoderms make up what is considered to be the earliest branch of the gnathostome family tree - the earliest branch of the jawed fishes.
