1. What classes of Annelids lack parapodia?

2. Its elongated body is composed of many segments, each bearing a pair of parapodia.

3. The Polychaeta lack a Clitellum and have parapodia, paddle-like appendages with numerous bristles or chaetae.

4. Unlike the class of Polychaeta, they do not have parapodia and their heads are less developed.

5. Expression of Apterous and lim1 in discrete components of developing parapodia is intriguing but does not map to comparable expression of these genes in developing arthropod appendages