Crayfish belongs to the class arthopoda.
Thus in this way the common characteristics of kingdom annelids and arthopda are –
1 The body of both the annelids and arthopoda is segmented. Annelids have several segments in their body with each segment having all essential body systems for life such as respiratory system , nervous system etc. while the crayfish (arthopods) has two body parts a) cephalothorax having head and upper body b) segmented abdomen.
2. They both live in water