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Byju's Answer
Standard XII
Biology
Class Cyclostomata
Which of the ...
Question
Which of the following classes doesn't belong to the superclass Agnatha?
A
Ostracoderm
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B
Cyclostomata
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C
Placodermi
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D
Chondrictheyes
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Solution
The correct options are
A
Placodermi
B
Chondrictheyes
Agnatha is a superclass of jawless fish i.e these animals have no jaws.
They come under the phylum chordata, subphylum vertebrata and includes the Cyclostomes and extinct Ostracoderm species.
Placodermi is a class of armoured prehistoric fish having plated skin belonging to the superclass Gnathostomata (having jaws).
Chondrichthyes is a class which contains cartilaginous fishes and belong to the superclass Gnathostomata.
So the correct answer is 'Placodermi and Chondrichthyes'.
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