Why Amphioxus Is Chordate?

amphioxus, plural amphioxi, or amphioxuses, also called lancelet, any of certain members of the invertebrate subphylum Cephalochordata of the phylum Chordata. ... The chordate features—the notochord (or stiffening rod), gill slits, and dorsal nerve cord—appear in the larvae and persist into adulthood.

Why is amphioxus considered a chordate?

Complete answer: The excretory system of amphioxus contains the protonephridia and hence it is also called as the degenerated chordata. ... The paired limbs, distinct head, also distinct paired sense organs are seen in the amphioxus and also the gonads are without gonoducts.

Why is amphioxus a chordate but not a vertebrate?

From the given organisms, the Amphioxus is a chordate but not a vertebrate. Amphioxus, commonly known as lancelet, is a marine fish like chordate that possesses a dorsal nerve cord which is not protected by bone but by a simple notochord made up of a cylindrical cell pattern, closely packed to form a toughened rod.