• Absence of cell wall.
• Heterotrophic.
• Plastids and vacuoles are generally absent and centrioles and lysosomes are present.
• Reserve food is in the form of glycogen.
Phylum: Chordata
• Presence of notochord.
• Presence of gill slits.
• Presence of dorsal tubular nerve cord.
Sub-Phylum: Craniata
• Presence of brain box (cranium).
• Vertebrae surrounding nerve cord.
Division: Gnathostomata
• Presence of true jaw.
• Presence of paired nostrils.
Super-class: Pisces
• Aquatic habitat.
• Streamlined body.
• Respiration by means of pharyangeal gills.
• Locomotion by means of fins.
• Body is generally covered by scales.
• Presence of internal ear.
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