An earthworm is a tubular, segmented worm of the phylum Annelida. They occur worldwide and are commonly found in soil, eating live and dead organic matter.
Echinoderm is the name given to a member of the phylum Echinodermata. They have radial symmetry and this includes sea urchins, sand dollars, sea stars and sea cucumbers. It is suggested that they are related to the chordates which is the answer.