Table of contents | |
Phylum Chordata | |
Chordata | |
Classification of Phylum Chordata | |
Subphylum Cephalochordata | |
Subphylum Vertebrata or Craniata |
Introduction to Animal Kingdom
Phylum Chordata Overview
acraniaprotochordate
Gnathostomata
Class 1. Chondrichthyes:
Chondrichthyes are marine fishes with a completely cartilaginous endoskeleton. They have a ventral mouth, tough skin coated with minute placoid scales, and respire through gills. These fishes have fins for locomotion and balance, with tail fins being heterocercal. Examples include Scoliodon, Sphyrna, Torpedo, etc.
Class 2. Osteichthyes:
Osteichthyes consist of marine and freshwater fish with a partly or wholly bony endoskeleton. Their bodies are generally spindle-shaped, with skin that is either naked or covered in cycloid or ctenoid scales. They respire through gills, lay eggs, and fertilization is external. Examples include Labeo, Hippocampus, Anabas, etc.
Class 3. Amphibia:
Amphibia include frogs, toads, newts, and salamanders. These creatures inhabit both freshwater and land, typically moist areas. Their skin is smooth or rough, often moist, slimy, glandular, and mostly lacks scales. They have a three-chambered heart, with double circulation. Amphibia are ectothermic (cold-blooded).
Class 4. Reptilia:
Class 5. Aves:
Class 6: Mammalia:
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1. What are the main characteristics of Phylum Chordata? |
2. What are the two subphyla of Phylum Chordata? |
3. How do organisms in Subphylum Cephalochordata differ from those in Subphylum Vertebrata? |
4. Can you give an example of an organism belonging to Subphylum Vertebrata? |
5. What is the significance of the characteristics of Phylum Chordata in terms of their evolutionary success? |
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