How are the vertebrates are further divided by divisions? Write the si

1.	How are the vertebrates are further divided by divisions? Write the significance.
Answer» 1. Subphylum Vertebrata is divided into two divisions, Agnatha and Gnathostomata. Agnatha Agnatha includes jawless fish-like aquatic. Vertebrates without paired appendages. Notochord persists in the adult. Agnatha includes class-Cyclostomata. Gnathostomata It includes jawed vertebrates with paired appendages. Notochord is replaced partly or wholly by the vertebral column. It includes jawed fishes (Pisces) and Tetrapoda (amphibia, reptilia, aves and mammals). Pisces includes all fishes which are essentially aquatic forms with paired fins for swimming and gills for respiration. Pisces includes cartilaginous fishes (Chondrichthyes) and bony fishes (Osteicthyes).

How are the vertebrates are further divided by divisions? Write the significance.

Answer»

1. Subphylum Vertebrata is divided into two divisions, Agnatha and Gnathostomata. Agnatha

Agnatha includes jawless fish-like aquatic.

Vertebrates without paired appendages.

Notochord persists in the adult.

Agnatha includes class-Cyclostomata.

Gnathostomata

It includes jawed vertebrates with paired appendages.

Notochord is replaced partly or wholly by the vertebral column.

It includes jawed fishes (Pisces) and Tetrapoda (amphibia, reptilia, aves and mammals).

Pisces includes all fishes which are essentially aquatic forms with paired fins for swimming and gills for respiration.

Pisces includes cartilaginous fishes (Chondrichthyes) and bony fishes (Osteicthyes).