Organisms in the subphylum of Cephalochordata are known as lancelets or as amphioxus. Cephalochordates are small, eel-like animals that spend much of their time buried in the sand. They contain all the typical chordata features, but they lack features found in almost all true vertebrates: the brain is very small and poorly developed, sense organs are also poorly developed, and there are no real vertebrae. The sexes are separate, and both males and females have multiple paired gonads. Eggs are fertilized externally, and develop into free-swimming, fishlike larvae.
lancelets
Scientific name: Branchiostomiformes
Higher classification: Leptocardii
Rank: Order
Higher classification: Leptocardii
Rank: Order