Home ยป In the course of evolution, true coelom appeared for the first time in Animal Kingdom MCQs In the course of evolution, true coelom appeared for the first time in January 4, 2022 7 Views Q. In the course of evolution, true coelom appeared for the first time in A. Chordata B. Annelida C. Aschelminthes D. Echinodermata Answer: Annelida