Kingdom Animalia — Biology STD 11 Science — Question
Maharashtra BoardEnglish MediumSTD 11 ScienceBiologyKingdom Animalia3 Marks
Question
Explain in brief the divisions of sub-phylum Vertebrata.
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Answer
Sub-phylum vertebrata is divided into two divisions: Agnathostomata (lacks jaw) and Gnathostomata (bears jaw) on the basis of presence/absence of jaws. 1. Division Agnathostomata: This division consist of the lowest or most primitive vertebrates that lack jaws. They include only one class of living vertebrates, the Cyclostomata. 2. Division Gnathostomata: This division includes animals with jaws. It is divided into two superclasses: Pisces (bear fins) and Tetrapoda (bear four limbs)
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