CLASSIFICATION
NINE COMMON ANIMAL PHYLA
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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lungfish
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lamprey
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Axolotl
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hagfish
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Detailed explanation-1: -Agnatha are jawless fish. Lampreys and hagfish are in this class. Members of the agnatha class are probably the earliest vertebrates. Scientists have found fossils of agnathan species from the late Cambrian Period that occurred 500 million years ago.
Detailed explanation-2: -The oldest fossil agnathans appeared in the Cambrian, and two groups still survive today: the lampreys and the hagfish, comprising about 120 species in total.
Detailed explanation-3: -There are two categories of jawless fish: hagfish and lampreys.
Detailed explanation-4: -Agnatha includes jawless fishes like hagfishes and Lampreys.
Detailed explanation-5: -Hagfish, the class Myxini (also known as Hyperotreti), are eel-shaped, slime-producing marine fish (occasionally called slime eels). They are the only known living animals that have a skull but no vertebral column, although hagfish do have rudimentary vertebrae.