Class Chondrichthyes, Elasmobranchii and Holocephali
Sharks, ratfishes, and rays are included in class
chordata
Chondrichthyes
elasmobranchii
Holocephali
Chondrichthyes
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Sharks have a cartilaginous structure and it may becomeA. calcareous
B. partially ossified
C. completely ossified
D. lignified
Pharyngeal slits in member of subclass Holocephali is covered with:
A. lid
B. lobe
C. operculum
D. jaws
In members of subclass Holocephali, teethes are modified into:
A. dentine
B. jaws
C. crushing plates
D. tail
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