THE CHORDATES       

       Chordates are characterised by a rod-like notochord and a hollow nerve cord on the dorsal side of the gut, and pharynx being perforated with gill slits for respiration. Vertebrates have a vertebral column that replaces the notochord, cephalization of the nervous system, a ventral heart, a post-anal tail and division of the coelom into chambers.          

   The following chapters appear in this section. Click on the title to open.

• Books on Chordata
• Classification of Chordata
• Origin of Chordates
• Urochordata – Herdmania
• Cephalochordata – Branchiostoma
• Metamorphosis
• Retrogressive Metamorphosis
• Classification of Pisces
• Scales in fishes
• Respiration in fishes
• Locomotion in fishes
• Migration in fishes
• Classification of Amphibia
• Origin of tetrapods
• Parental care in Amphibia
• Neoteny–Paedomorphosis & Paedogenesis
• Skull types in reptiles
• Classification & Adaptive Radiation in reptiles
• Origin of reptiles
• Status and affinities of Sphenodon
• Status of crocodiles
• Snakes of India
• Classification of birds
• Origin and evolution of birds
• Flight adaptation in birds
• Migration in birds
• Characteristics and classification of mammals
• Origin and evolution of mammals
• Egg-laying mammals
• Marsupial mammals
• American Marsupials
• Aquatic mammals
• Primates, diversity and social life

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