Amphioxus
Phylum: Chordata
Sub - phylum: Urochordata
Class: Leptocardii
Order: Amphioxiformes
• Popularly known as ‘Lancelet’.
• Primitive chordate.
• Exhibits curious combination of primitive, specilised and degenerate features.
• Forward prolongation of notochord.
• Absence of well developed brain and specilised sense organs.
• Small, almost transparent, superficially fish like animal.
• Paired fins are absent.
• Oral hood surrounded by oral cirri.