Coelomate unsegmented animals are included under
Annelida, Arthropoda and Mollusca
Mollusca, Echinodermata and Hemichordata
Arthropoda, Mollusca and Echinodermata
Aschelminthes, Mollusca and Echinodermata
Mollusca, Echinodermata and Hemichordata include unsegmented animals with a true coelom.
Annelids and arthropods are metamerically segmented.
Aschelminthes are pseudocoelomates.