Q. Go through the following flow chart for division of subphylum vertebrata. Fill the gaps A, B, C and D and select the correct option.
image
A B C D
(a) Ostracodermi Cyclostomata Pisces Tetrapoda
(b) Cyclostomata Ostracodermi Pisces Tetrapoda
(c) Ostracodermi Tetrapoda Cyclostomata Pisces
(d) Pisces Ostracodermi Tetrapoda Cyclostomata

 2575  189 Animal Kingdom Report Error

Solution:

Subphylum Vertebrata is divided into two divisions. They are agnatha (jawless) and gnathostomata (with jaw). Agnatha are further divided into two dasses-Ostracodermi, which is extinct and Cyclostomata (e.g., hag fish). Jawed vertebrates are divided into two superdasses-Pisces (true fish) and Tetrapoda (four limbs).