Peripatus is said to be a connecting link between Annelida and Arthropoda.

Explanation

(1) Peripatus shows segmented body, thin cuticle and parapodia-like organs. (2) These characters are typical of Annelids. (3) Similarly, it also shows tracheal respiration and open circulatory system which is a characteristic feature of Arthropods. (4) Since Peripatus shares both these characters, it is said to be a connecting link between Annelida and Arthropoda.