A complete alimentary canal with a muscular pharynx and non-muscular intestine is present in

Ascaris (common roundworm) is included under phylum Aschelminthes. 

In Aschelminthes, the alimentary canal is complete with a well-developed muscular pharynx. 

Intestine is non-muscular. 

Alimentary canal is incomplete in Planaria (Platyhelminthes). 

Nereis (Annelida) has a complete alimentary canal with a muscular intestine. 

In Ophiura (brittle star), anus is absent.