Home ยป Head. Foot and visceral mass-this combination of characters is diagnostic of Animal Kingdom MCQs Head. Foot and visceral mass-this combination of characters is diagnostic of January 4, 2022 19 Views Q. Head. Foot and visceral mass-this combination of characters is diagnostic of A. Echinoderms B. Arthropods C. Molluscs D. Annelida Answer: Molluscs