Multiple choice Which organism represents the phyla, whose members lack mouth and anus? Spongilla Hydra Planaria Ascaris Reveal answer Fill a bubble to check yourself A Correct answer Explanation Phylum Porifera (sponges) are the only animals that lack both a mouth and an anus. They feed through specialized cells called choanocytes that capture food particles from water flowing through their pores. Spongilla is a freshwater sponge.