ZOO202 Complete Slides

Characteristics of Protochordata (Tunicates & Amphioxus)

The organisms belonging to the Protochordata are generally known as the lower chordates. They don’t form a “proper” taxonomic group and are only classified as such for convenience purposes. However, they do form a major division of Chordata. They are also known as Acraniata because they lack a true skull.

Characteristics of Protochordata

They are generally found in marine water. Their body is bilaterally symmetrical, triploblastic, and coelomated. At a certain stage of their lives, their body develops a long, rod-like structure for support called notochord. They exhibit organ system level of organization. Eg., Herdmania, Amphioxus.