Classification of Phylum Chordata
1. What are Chordates?
• A chordate is an animal of the phylum Chordata. During some period of their life cycle, possess a notochord, A dorsal tubular nerve cord, Pharyngeal gill slits, An endostyle, (is a groove in the ventral wall of the pharynx) and A post-anal tail: these five anatomical features define this phylum.
• Chordates are also bilaterally symmetric, have a coelom, metameric
segmentation, and circulatory system.
• All chordates are deuterostomes. This means that, during the embryo
development stage, the anus forms before the mouth.
• 2. Classification of Phylum Chordata
• Phylum: Chordata is classified in to two groups, acraniata and craniata.
• Group I: Acrania
• Subphylum 1. Hemichordate
• Class 1. Enteropneusta
• Class 2. Pterobranchia
• Subphylum 2. Urochordata
• Class1. Ascidiacea
• Class 2. Thaliacea
• Class 3. Larvacea
• Subphylum 3. Cephalochordate
• Class: Leptocardi
• Group II: Craniata
• Subphylum - Vertebrata
• Division 1. Agnatha
• Class 1. Ostracodermi
• Class 2. Cyclostomata
• Division 2. Gnathostomata
• Superclass 1 : Pisces
• Class 1. Placodermi
• Class 2. Chondrichthyes
• Class 3. Osteichthyes
• SuperClass 2. Terapoda
• Class 1. Amphibia
• Class 2. Reptilia
• Class 3. Aves
• Class 4. Mammalia
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