What are the Characteristics of Phylum Hemicordata?

The main characteristics of Phylum Hemicordata are given below:

1) Bilaterally symmetrical. Body has more than two cell layers, tissues and organs.

2) Body cavity a true coelom

3) Body possesses a through gut, straight or U-shaped, with an anus.

4) Body divided into three sections, a proboscis, a collar and a trunk.

5) Nervous system normally diffuse, but variable.

6) Has a partially open circulatory system. Possesses glomerulus as an excretory organ.

7) Gonands one too many pairs.

8) Development indirect, usually with free swimming tornaria lava stage.

Ex: – Balanoglossus etc.