Home » 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 50 Views Q. Head. Foot and visceral mass-this combination of characters is diagnostic ofA. EchinodermsB. ArthropodsC. MolluscsD. AnnelidaAnswer: Molluscs