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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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